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  • 1.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Double Excitations in Helium Atoms and Lithium Compounds2006Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis addresses the investigation of doubly excited 2l´nl states in helium atoms and double core excitations in solid lithium compounds.

    Measurements on He are made in field free environments and under the influence of electric and magnetic fields, using synchrotron based inelastic photon scattering. Cross sections for scattering to singly excited final states are directly determined and compared to theoretical results and are found to be in excellent agreement. Radiative and spin-orbit effects are quantified and are shown to play an important role in the overall characterization of highly excited He states below the N =2 threshold. A dramatic electric field dependence is also observed in the flourecence yield already for relatively weak fields. This signal increase, induced by electric as well as magnetic fields, is interpreted in terms of mixing with states of higher fluorescence branching ratios.

    Double core excitations at the lithium site in solid lithium compounds are investigated using resonant inelastic x-ray scattering (RIXS). The lithium halides LiF, LiCl, LiBr and LiI are studied as well as the molecular compounds Li2O, Li2CO3 and LiBF4. States with one, as well as both, of the excited electrons localized at the site of the bare lithium nucleus are identified, and transitions which involve additional band excitations are observed. A strong influence of the chemical surrounding is found, and it is discussed in terms of the ionic character of the chemical bond.

    List of papers
    1. Resonant Inelastic Photon Scattering in Helium
    Open this publication in new window or tab >>Resonant Inelastic Photon Scattering in Helium
    Show others...
    (English)Manuscript (Other academic)
    Identifiers
    urn:nbn:se:uu:diva-94515 (URN)
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2012-10-09Bibliographically approved
    2. Radiative and Relativistic Effects in the Decay of Highly Excited States in Helium
    Open this publication in new window or tab >>Radiative and Relativistic Effects in the Decay of Highly Excited States in Helium
    Show others...
    2000 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 85, no 6, p. 1202-1205Article in journal (Refereed) Published
    Abstract [en]

    A recent experimental study [J.-E. Rubensson et al., Phys. Rev. Lett. 83, 947 (1999)] measured a significant fluorescence yield of the He( 2lnl) photoexcited resonances, showing major qualitative differences from nonrelativistic predictions. We present a further theoretical study of these states, and perform R-matrix multichannel quantum defect theory calculations to extract fluorescence and ionization cross sections. These theoretical results are in excellent agreement with newer, higher-resolution measurements. Radiative and spin-orbit effects are quantified and shown to play an important role in the overall characterization of highly excited states.

    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94516 (URN)10.1103/PhysRevLett.85.1202 (DOI)
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2017-12-14Bibliographically approved
    3. Double Excitations of Helium in Weak Static Electric Fields
    Open this publication in new window or tab >>Double Excitations of Helium in Weak Static Electric Fields
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    2006 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, p. 043002-Article in journal (Refereed) Published
    Abstract [en]

    A dramatic electric field dependence has been observed in the fluorescence yield spectrum of the doubly excited states in helium, where a rich phenomenology is encountered below the N=2 threshold. Fluorescence yields of certain states can be tuned to zero, while other dipole-forbidden states are significantly enhanced, for fields much weaker than 1  kV/cm. Using an R-matrix multichannel quantum defect theory, spherical-to-parabolic frame transformation method, we are able to reproduce the main features of the observed spectrum, and we discuss the qualitative behavior in terms of weak electric field mixing.

    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94517 (URN)10.1103/PhysRevLett.96.043002 (DOI)
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2017-12-14Bibliographically approved
    4. Magnetic-field induced enhancement in the fluorescence yield spectrum of doubly excited states in helium
    Open this publication in new window or tab >>Magnetic-field induced enhancement in the fluorescence yield spectrum of doubly excited states in helium
    Show others...
    2006 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, no 25, p. 253002-Article in journal (Refereed) Published
    Abstract [en]

    An influence of static magnetic fields on the fluorescence yield spectrum of He in the vicinity of the N=2 thresholds has been observed. The experimental results are in excellent agreement with predictions based on multichannel quantum defect theory, and it is demonstrated that the Rydberg electron ℓ mixing due to the diamagnetic interaction is essential for the description of the observed fluorescence yield intensity enhancement.

    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-95806 (URN)10.1103/PhysRevLett.97.253002 (DOI)000243414600018 ()
    Available from: 2007-04-24 Created: 2007-04-24 Last updated: 2017-12-14
    5. Resonant Inelastic Soft X-ray Scattering at Hollow Lithium States in Solid LiCl
    Open this publication in new window or tab >>Resonant Inelastic Soft X-ray Scattering at Hollow Lithium States in Solid LiCl
    Show others...
    2004 (English)In: Physical Review Letters, Vol. 93, no 1, p. 016404-Article in journal (Refereed) Published
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94519 (URN)
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2016-04-26Bibliographically approved
    6. Resonant inelastic soft x-ray scattering at double core excitations in solid LiCl
    Open this publication in new window or tab >>Resonant inelastic soft x-ray scattering at double core excitations in solid LiCl
    Show others...
    2006 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 73, no 24, article id 245111Article in journal (Refereed) Published
    Abstract [en]

    Inelastic soft x-ray scattering in LiCl, resonantly enhanced at states with two Li 1s vacancies, is investigated. States in which both excited electrons are localized during the double core hole lifetime, in which one of the electrons delocalize, as well as triply excited states in which the double core excitation is accompanied by a valence-to-conduction band excitation, contribute to the scattering. The angular momentum symmetry of the involved states and the vibronic coupling during the scattering process are reflected in the angular anisotropy. The effect on the local electronic structure of multiple core holes is theoretically studied by means of supercell band calculations.

    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94520 (URN)10.1103/PhysRevB.73.245111 (DOI)000238696900035 ()
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2017-12-14Bibliographically approved
    7. Double Core Excitations in Lithium Halides
    Open this publication in new window or tab >>Double Core Excitations in Lithium Halides
    2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 4, p. 045112-Article in journal (Refereed) Published
    Abstract [en]

    Resonant inelastic x-ray scattering spectra of LiF , LiCl , LiBr , and LiI excited in the vicinity of the Li double core hole resonances are presented. All lithium halides show similar phenomenology, including scattering via states where both excited electrons are localized during the scattering process, as well as states where one electron delocalizes. Also transitions that involve additional band excitations are observed. A strong influence of the chemical surrounding is found, and it is discussed in terms of the ionic character of the chemical bond.

    Keywords
    X-ray scattering, Electron density of states and band structure of crystalline solids, Solid alkali halides
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94521 (URN)10.1103/PhysRevB.75.045112 (DOI)000243895600029 ()
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2017-12-14Bibliographically approved
    8. Double Excitations at the Lithium Site in Solid Li Compounds
    Open this publication in new window or tab >>Double Excitations at the Lithium Site in Solid Li Compounds
    (English)Manuscript (Other academic)
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94522 (URN)
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2012-09-18Bibliographically approved
    9. Multi-Center Resonant Inelastic Soft X-ray Scattering in LiI?
    Open this publication in new window or tab >>Multi-Center Resonant Inelastic Soft X-ray Scattering in LiI?
    (English)Manuscript (Other academic)
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94523 (URN)
    Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2012-09-18Bibliographically approved
  • 2.
    Agåker, Marcus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Andersson, J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Englund, C.-J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Olsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Ström, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Nordgren, J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Novel instruments for ultra-soft X-ray emission spectroscopy2009In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 601, no 1-2, p. 213-219Article in journal (Refereed)
    Abstract [en]

    Two alternative instrument designs to the traditional Rowland grating spectrometer for high resolution ultra-soft X-ray spectroscopy are presented. The first instrument is a plane grating spectrometer using off-axis parabolic mirrors for collection and refocusing, and with a spatially resolving multichannel detector with delay line read-out. The instrument offers substantially higher performance in terms of resolution and sensitivity than traditional instruments. The second instrument is a Fourier transform spectrometer based on a grazing incidence Mach-Zehnder interferometer using wavefront dividing beamsplitters. The path length difference can be scanned over 0.1 mm, which corresponds to a resolution of 12 meV. (C) 2009 Elsevier B.V. All rights reserved.

  • 3.
    Agåker, Marcus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Andersson, Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Englund, Carl-Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Rausch, J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Surface and Interface Science.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Spectroscopy in the vacuum-ultraviolet2011In: Nature Photonics, ISSN 1749-4885, Vol. 5, no 5, p. 248-248Article in journal (Refereed)
  • 4.
    Agåker, Marcus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Andersson, Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Englund, J.C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Rausch, Joachim
    Giessen University.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Spectroscopy in the vacuum-ultraviolet2011In: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 5, p. 248-Article in journal (Refereed)
  • 5.
    Agåker, Marcus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Käämbre, Tanel
    Glover, Chris
    Schmitt, Thorsten
    Mattesini, Maurizio
    Ahuja, Rajeev
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Resonant inelastic soft x-ray scattering at double core excitations in solid LiCl2006In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 73, no 24, article id 245111Article in journal (Refereed)
    Abstract [en]

    Inelastic soft x-ray scattering in LiCl, resonantly enhanced at states with two Li 1s vacancies, is investigated. States in which both excited electrons are localized during the double core hole lifetime, in which one of the electrons delocalize, as well as triply excited states in which the double core excitation is accompanied by a valence-to-conduction band excitation, contribute to the scattering. The angular momentum symmetry of the involved states and the vibronic coupling during the scattering process are reflected in the angular anisotropy. The effect on the local electronic structure of multiple core holes is theoretically studied by means of supercell band calculations.

  • 6.
    Agåker, Marcus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Double core excitations in LiI: Evidence for multicenter coupling in resonant inelastic soft x-ray scattering spectra2006In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 24, p. 241105-Article in journal (Refereed)
    Abstract [en]

    Resonances in inelastic soft x-ray scattering spectra of LiI, in which final states with Li 1s as well as I 4d vacancies are populated have been observed. The intermediate states involve both Li 1s double core excitations and I parallel to 4p(-1)+4d(-2)4f > states. It is suggested that the spectra are influenced by multicenter coupling.

  • 7.
    Agåker, Marcus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Double Core Excitations in Lithium Halides2007In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 4, p. 045112-Article in journal (Refereed)
    Abstract [en]

    Resonant inelastic x-ray scattering spectra of LiF , LiCl , LiBr , and LiI excited in the vicinity of the Li double core hole resonances are presented. All lithium halides show similar phenomenology, including scattering via states where both excited electrons are localized during the scattering process, as well as states where one electron delocalizes. Also transitions that involve additional band excitations are observed. A strong influence of the chemical surrounding is found, and it is discussed in terms of the ionic character of the chemical bond.

  • 8.
    Agåker, Marcus
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Söderström, Johan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Käämbre, Tanel
    Glover, C
    Gridneva, L
    Department of Physics and Materials Science, Physics II. Physics IV.
    Schmitt, Thorsten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Augustsson, Andreas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Mattesini, M
    Ahuja, Rajeev
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Resonant inelastic soft X-ray scattering at hollow lithium states in solid LiCl2004In: Physical Review Letters, Vol. 93Article in journal (Refereed)
  • 9.
    Agåker, Marcus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Söderström, Johan
    Käämbre, Tanel
    Glover, Chris
    Gridneva, Lidia
    Schmitt, Thorsten
    Augustsson, Andreas
    Mattesini, Maurizio
    Ahuja, Rajeev
    Rubensson, Jan-Erik
    Resonant Inelastic Soft X-ray Scattering at Hollow Lithium States in Solid LiCl2004In: Physical Review Letters, Vol. 93, no 1, p. 016404-Article in journal (Refereed)
  • 10. Alagia, M
    et al.
    Richter, R
    Stranges, S
    Agåker, Marcus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Ström, Magnus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Söderström, Johan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Såthe, Conny
    Department of Physics and Materials Science, Physics II.
    Feifel, Raimund
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Sorensen, Stacey
    de Fanis, A
    Ueda, K
    Fink, R
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Core level ionization dynamics in small molecules studied by x-ray-emission threshold-electron coincidence spectroscopy2005In: Physical Review A, Vol. 71, no 1Article in journal (Refereed)
  • 11. Alagia, Michele
    et al.
    Richter, Robert
    Stranges, Stefano
    Agåker, Marcus
    Ström, Magnus
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Såthe, Conny
    Feifel, Raimund
    Sorensen, Stacey
    De Fanis, Alberto
    Core level ionization dynamics in small molecules studied by x-ray-emission threshold-electron coincidence spectroscopy2005In: Physical Review A, ISSN 1050-2947, Vol. 71, p. 012506-Article in journal (Refereed)
  • 12. Brandenburg, T
    et al.
    Agåker, Marcus
    Atak, K
    Pflüger, M
    Schwanke, C
    Petit, T
    Lange, K M
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Aziz, E F
    The electronic structure of perfluorodecalin studied by soft X-ray spectroscopy and electronic structure calculations2014In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 16, no 42, p. 23379-23385Article in journal (Refereed)
    Abstract [en]

    Fluorine and carbon K absorption and emission spectra of liquid perfluorodecalin are presented and analyzed in terms of density functional calculations-configuration interaction. A comprehensive view of the electronic structure is given, and site-specific intramolecular interactions are investigated in detail. It is found that, while the outer fluorine atoms have excess charge in the ground state, the lowest excitations must be associated with charge transfer towards the inner carbon atoms.

  • 13.
    Ekholm, Victor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Gråsjö, Johan
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Dong, Minjie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Björneholm, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Såthe, Conny
    Uppsala University.
    Chatzigeorgiou, Evanthia
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Harada, Yoshihisa
    Miyawaki, Jun
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Aqueous carbonate and bicarbonate ions studied by RIXS at the O K-edgeManuscript (preprint) (Other academic)
  • 14.
    Englund, Carl-Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Fredriksson, Pierre
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Olsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Johansson, Niklas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    An ultra-high vacuum chamber for scattering experiments featuring in-vacuum continuous in-plane variation of the angle between entrance and exit vacuum ports2015In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 86, no 9, article id 095110Article in journal (Refereed)
    Abstract [en]

    A concept that enables in-vacuum continuous variation of the angle between two ports in one plane has been developed and implemented. The vacuum chamber allows for measuring scattering cross sections as a function of scattering angle and is intended for resonant inelastic X-ray scattering experiments. The angle between the ports can be varied in the range of 30 degrees-150 degrees, while the pressure change is less than 2 x 10(-10) mbars.

  • 15. Glover, C.J.
    et al.
    Schmitt, T
    Mattesini, M
    Adell, M
    Ilver, L
    Kanski, J
    Kjeldgaard, L
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Mårtensson, N
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Surface and Interface Science.
    Ahuja, R
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Nordgren, J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Rubensson, J.-E.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Stationary and dispersive features in resonant inelastic soft X-ray scattering at the Ge 3p resonances2009In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526, Vol. 173, no 2-3, p. 103-107Article in journal (Refereed)
    Abstract [en]

    Resonant inelastic soft X-ray scattering at the 3p resonances in crystalline Ge is presented. Both stationary and dispersive features are observed in a wide energy range above as well as below the ionization limits. These observations are in agreement with theoretical predictions based on a two-step model where the initially excited electron has no influence on the emission step. Excess population of states in the conduction band is found, and discussed in terms of attosecond electron dynamics. (c) 2009 Elsevier B.V. All rights reserved.

  • 16. Gorczyca, Thomas
    et al.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Såthe, Conny
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Ström, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Ding, Dajun
    Stranges, Stefano
    Richter, Robert
    Alagia, Michele
    Radiative and Relativistic Effects in the Decay of Highly Excited States in Helium2000In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 85, no 6, p. 1202-1205Article in journal (Refereed)
    Abstract [en]

    A recent experimental study [J.-E. Rubensson et al., Phys. Rev. Lett. 83, 947 (1999)] measured a significant fluorescence yield of the He( 2lnl) photoexcited resonances, showing major qualitative differences from nonrelativistic predictions. We present a further theoretical study of these states, and perform R-matrix multichannel quantum defect theory calculations to extract fluorescence and ionization cross sections. These theoretical results are in excellent agreement with newer, higher-resolution measurements. Radiative and spin-orbit effects are quantified and shown to play an important role in the overall characterization of highly excited states.

  • 17.
    Gorczyca, TW
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Rubensson, JE
    Sathe, C
    Strom, M
    Agaker, Marcus
    Ding, DJ
    Stranges, S
    Richter, R
    Alagia, M
    Radiative and relativistic effects in the decay of highly excited states in helium2000In: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 85, no 6, p. 1202-1205Article in journal (Refereed)
    Abstract [en]

    A recent experimental study [J.-E. Rubensson et al., Phys. Rev. Lett. 83, 947 (1999)] measured a significant fluorescence yield of the He(2lnl') photoexcited resonances, showing major qualitative differences from nonrelativistic predictions. We present a

  • 18. Kimberg, Victor
    et al.
    Sanchez-Gonzalez, Alvaro
    Mercadier, Laurent
    Weninger, Clemens
    Lutman, Alberto
    Ratner, Daniel
    Coffee, Ryan
    Buchner, Maximilian
    Mucke, Melanie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Såthe, Conny
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Bostedt, Christoph
    Nordgren, Joseph
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Rohringer, Nina
    Stimulated X-ray Raman scattering - a critical assessment of the building block of nonlinear X-ray spectroscopy2016In: Faraday discussions (Online), ISSN 1359-6640, E-ISSN 1364-5498, Vol. 194, p. 305-324Article in journal (Refereed)
    Abstract [en]

    With the invention of femtosecond X-ray free-electron lasers (XFELs), studies of light-induced chemical reaction dynamics and structural dynamics reach a new era, allowing for time-resolved X-ray diffraction and spectroscopy. To ultimately probe coherent electron and nuclear dynamics on their natural time and length scales, coherent nonlinear X-ray spectroscopy schemes have been proposed. In this contribution, we want to critically assess the experimental realisation of nonlinear X-ray spectroscopy at current-day XFEL sources, by presenting first experimental attempts to demonstrate stimulated resonant X-ray Raman scattering in molecular gas targets.

  • 19.
    Nordgren, Joseph
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Engwall, LarsUppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.Gräslund, Ann-SofieUppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Archaeology and Ancient History.Andersson, PerUppsala University, University Administration.Sjölund, MajvorUppsala University, University Administration.Agåker, MarcusUppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Quality and Renewal 2007: An Overall Evaluation of Research at Uppsala University 2006/20072007Collection (editor) (Other (popular science, discussion, etc.))
  • 20.
    Rohringer, N.
    et al.
    Max Planck Inst Phys Komplexer Syst, Dresden, Germany.;Ctr Free Electron Laser Sci, Hamburg, Germany..
    Kimberg, V.
    Max Planck Inst Phys Komplexer Syst, Dresden, Germany.;Ctr Free Electron Laser Sci, Hamburg, Germany..
    Weninger, C.
    Max Planck Inst Phys Komplexer Syst, Dresden, Germany.;Ctr Free Electron Laser Sci, Hamburg, Germany..
    Sanchez-Gonzalez, A.
    Univ London Imperial Coll Sci Technol & Med, London, England..
    Lutman, A.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA..
    Maxwell, T.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA..
    Bostedt, C.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA..
    Monterro, S. Carron
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA..
    Lindahl, A. O.
    Univ Gothenburg, Dept Phys, Gothenburg, Sweden.;SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA USA..
    Ilchen, M.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA.;European XFEL GmbH, Hamburg, Germany..
    Coffee, R. N.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA.;SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA USA..
    Bozek, J. D.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA..
    Krzywinski, J.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA..
    Kierspel, T.
    Ctr Free Electron Laser Sci, Hamburg, Germany.;Univ Hamburg, Hamburg, Germany.;DESY, Notkestr 85, Hamburg, Germany..
    Mullins, T.
    Ctr Free Electron Laser Sci, Hamburg, Germany.;Univ Hamburg, Hamburg, Germany.;DESY, Notkestr 85, Hamburg, Germany..
    Kuepper, J.
    Ctr Free Electron Laser Sci, Hamburg, Germany.;Univ Hamburg, Hamburg, Germany.;DESY, Notkestr 85, Hamburg, Germany..
    Erk, B.
    DESY, Notkestr 85, Hamburg, Germany..
    Rolles, D.
    DESY, Notkestr 85, Hamburg, Germany..
    Muecke, O. D.
    DESY, Notkestr 85, Hamburg, Germany..
    London, R. A.
    Lawrence Livermore Natl Lab, Livermore, CA USA..
    Purvis, M.
    Colorado State Univ, Ft Collins, CO 80523 USA..
    Ryan, D.
    Colorado State Univ, Ft Collins, CO 80523 USA..
    Rocca, J. J.
    Colorado State Univ, Ft Collins, CO 80523 USA..
    Feifel, R.
    Univ Gothenburg, Dept Phys, Gothenburg, Sweden..
    Squibb, R.
    Univ Gothenburg, Dept Phys, Gothenburg, Sweden..
    Zhaunerchyk, V.
    Univ Gothenburg, Dept Phys, Gothenburg, Sweden..
    Såthe, Conny
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Mucke, Melanie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Stimulated X-Ray Raman Scattering with Free-Electron Laser Sources2016In: X-RAY LASERS 2014, 2016, p. 201-207Conference paper (Refereed)
    Abstract [en]

    Stimulated electronic x-ray Raman scattering is the building block for several proposed x-ray pump probe techniques, that would allow the study of electron dynamics at unprecedented timescales. We present high spectral resolution data on stimulated electronic x-ray Raman scattering in a gas sample of neon using a self-amplified spontaneous emission x-ray free-electron laser. Despite the limited spectral coherence and broad bandwidth of these sources, high-resolution spectra can be obtained by statistical methods, opening the path to coherent stimulated x-ray Raman spectroscopy. An extension of these ideas to molecules and the results of a recent experiment in CO are discussed.

  • 21.
    Sanchez-Gonzalez, A.
    et al.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Barillot, T. R.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Squibb, R. J.
    Univ Gothenburg, Dept Phys, SE-41296 Gothenburg, Sweden..
    Kolorenc, P.
    Charles Univ Prague, Fac Math & Phys, Inst Theoret Phys, CR-18000 Prague, Czech Republic..
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Averbukh, V.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Bearpark, M. J.
    Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England..
    Bostedt, C.
    SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA..
    Bozek, J. D.
    SOLEIL Synchrotron, PLEIADES Beamline, LOrme Merisiers, F-91192 Gif Sur Yvette, France..
    Bruce, S.
    Univ Texas, Texas Ctr High Energy Dens Sci CHEDS, Austin, TX 78712 USA..
    Montero, S. Carron
    SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA..
    Coffee, R. N.
    SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA..
    Cooper, B.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Cryan, J. P.
    SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA..
    Dong, Minjie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Eland, J. H. D.
    Univ Oxford, Dept Chem, Oxford OX1 3QZ, England..
    Fang, L.
    Univ Texas, Texas Ctr High Energy Dens Sci CHEDS, Austin, TX 78712 USA..
    Fukuzawa, H.
    Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan..
    Guehr, M.
    SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA..
    Ilchen, M.
    European XFEL GmbH, D-22761 Hamburg, Germany..
    Johnsson, A. S.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Liekhus-S, C.
    SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA.;Stanford Univ, Dept Phys, Stanford, CA 94305 USA.;Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA..
    Marinelli, A.
    SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA..
    Maxwell, T.
    SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA..
    Motomura, K.
    Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan..
    Mucke, Melanie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Natan, A.
    SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA.;Stanford Univ, Dept Phys, Stanford, CA 94305 USA.;Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA..
    Osipov, T.
    SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA..
    Östlin, Christofer
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Pernpointner, M.
    Heidelberg Univ, Theoret Chem, D-69120 Heidelberg, Germany..
    Petrovic, V. S.
    SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA.;Stanford Univ, Dept Phys, Stanford, CA 94305 USA.;Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA..
    Robb, M. A.
    Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England..
    Sathe, C.
    Lund Univ, MAX IV Lab, SE-22100 Lund, Sweden..
    Simpson, E. R.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Underwood, J. G.
    UCL, Dept Phys & Astron, London WC1E 6BT, England..
    Vacher, Morgane
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Theoretical Chemistry. Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England..
    Walke, D. J.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Wolf, T. J. A.
    SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA..
    Zhaunerchyk, V.
    Univ Gothenburg, Dept Phys, SE-41296 Gothenburg, Sweden..
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Berrah, N.
    Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA..
    Bucksbaum, P. H.
    SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA.;Stanford Univ, Dept Phys, Stanford, CA 94305 USA.;Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA..
    Ueda, K.
    Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan..
    Feifel, R.
    Univ Gothenburg, Dept Phys, SE-41296 Gothenburg, Sweden..
    Frasinski, L. J.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Marangos, J. P.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England..
    Auger Electron and Photoabsorption Spectra of Glycine in the Vicinity of the Oxygen K-edge Measured with an X-FEL2015In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 48, no 23, article id 234004Article in journal (Refereed)
    Abstract [en]

    We report the first measurement of the near oxygen K-edge auger spectrum of the glycine molecule. Our work employed an x-ray free electron laser as the photon source operated with input photon energies tunable between 527 and 547 eV. Complete electron spectra were recorded at each photon energy in the tuning range, revealing resonant and non-resonant auger structures. Finally ab initio theoretical predictions are compared with the measured above the edge auger spectrum and an assignment of auger decay channels is performed.

  • 22.
    Sanchez-Gonzalez, A.
    et al.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Micaelli, P.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Olivier, C.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Barillot, T. R.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Ilchen, M.
    SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA 94025 USA.;European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany..
    Lutman, A. A.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA..
    Marinelli, A.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA..
    Maxwell, T.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA..
    Achner, A.
    European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany..
    Agåker, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Berrah, N.
    Univ Connecticut, Dept Phys, 2152 Hillside Rd,U-3046, Storrs, CT 06269 USA..
    Bostedt, C.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA.;Argonne Natl Lab, Lemont, IL 60439 USA..
    Bozek, J. D.
    Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France..
    Buck, J.
    DESY, Notkestr 85, D-22607 Hamburg, Germany..
    Bucksbaum, P. H.
    SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA 94025 USA.;Stanford Univ, Dept Phys, 382 Via Pueblo Mall, Stanford, CA 94305 USA..
    Montero, S. Carron
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA.;Calif Lutheran Univ, Dept Phys, 60 West Olsen Rd, Thousand Oaks, CA 91360 USA..
    Cooper, B.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Cryan, J. P.
    SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA 94025 USA..
    Dong, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Feifel, R.
    Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden..
    Frasinski, L. J.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Fukuzawa, H.
    Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan..
    Galler, A.
    European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany..
    Hartmann, G.
    DESY, Notkestr 85, D-22607 Hamburg, Germany.;Univ Kassel, Inst Phys, Heinrich Plett Str 40, D-34132 Kassel, Germany.;Univ Kassel, CINSaT, Heinrich Plett Str 40, D-34132 Kassel, Germany..
    Hartmann, N.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA..
    Helml, W.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA.;Tech Univ Munich, Phys Dept E11, James Franck Str 1, D-85748 Garching, Germany..
    Johnson, A. S.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Knie, A.
    Univ Kassel, Inst Phys, Heinrich Plett Str 40, D-34132 Kassel, Germany.;Univ Kassel, CINSaT, Heinrich Plett Str 40, D-34132 Kassel, Germany..
    Lindahl, A. O.
    SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA 94025 USA.;Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden..
    Liu, J.
    European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany..
    Motomura, K.
    Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan..
    Mucke, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    O'Grady, C.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA..
    Rubensson, J-E.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Simpson, E. R.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Squibb, R. J.
    Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden..
    Sathe, C.
    Lund Univ, MAX Lab 4, Box 118, SE-22100 Lund, Sweden..
    Ueda, K.
    Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan..
    Vacher, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Theoretical Chemistry. Imperial Coll, Dept Chem, London SW7 2AZ, England..
    Walke, D. J.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Zhaunerchyk, V.
    Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden..
    Coffee, R. N.
    SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA..
    Marangos, J. P.
    Imperial Coll London, Dept Phys, London SW7 2AZ, England..
    Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning2017In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 8, article id 15461Article in journal (Refereed)
    Abstract [en]

    Free-electron lasers providing ultra-short high-brightness pulses of X-ray radiation have great potential for a wide impact on science, and are a critical element for unravelling the structural dynamics of matter. To fully harness this potential, we must accurately know the X-ray properties: intensity, spectrum and temporal profile. Owing to the inherent fluctuations in free-electron lasers, this mandates a full characterization of the properties for each and every pulse. While diagnostics of these properties exist, they are often invasive and many cannot operate at a high-repetition rate. Here, we present a technique for circumventing this limitation. Employing a machine learning strategy, we can accurately predict X-ray properties for every shot using only parameters that are easily recorded at high-repetition rate, by training a model on a small set of fully diagnosed pulses. This opens the door to fully realizing the promise of next-generation high-repetition rate X-ray lasers.

  • 23.
    Ström, Magnus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Såthe, Conny
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Stranges, Stefano
    Richter, Robert
    Alagia, Michele
    Gorczyca, Tom
    Robicheaux, Francis
    Magnetic-field induced enhancement in the fluorescence yield spectrum of doubly excited states in helium2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, no 25, p. 253002-Article in journal (Refereed)
    Abstract [en]

    An influence of static magnetic fields on the fluorescence yield spectrum of He in the vicinity of the N=2 thresholds has been observed. The experimental results are in excellent agreement with predictions based on multichannel quantum defect theory, and it is demonstrated that the Rydberg electron ℓ mixing due to the diamagnetic interaction is essential for the description of the observed fluorescence yield intensity enhancement.

  • 24.
    Ström, Magnus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Såthe, Conny
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Stranges, Stefano
    Richter, Robert
    Alagia, Michele
    Gorczyca, Tom
    Robicheaux, Francis
    Magnetic-field induced enhancement in the fluorescence yield spectrum of doubly excited states in helium2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, no 25, p. 253002-Article in journal (Refereed)
    Abstract [en]

    An influence of static magnetic fields on the fluorescence yield spectrum of He in the vicinity of the N=2 thresholds has been observed. The experimental results are in excellent agreement with predictions based on multichannel quantum defect theory, and it is demonstrated that the Rydberg electron ℓ mixing due to the diamagnetic interaction is essential for the description of the observed fluorescence yield intensity enhancement.

  • 25.
    Såthe, Conny
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Ström, Magnus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Agåker, Marcus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Söderström, Johan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Richter, R
    Alagia, M
    Stranges, S
    Gorczyca, T W
    Robicheaux, F
    Double excitations of helium in weak static electric fields2006In: Physical Review Letters, Vol. 96, no 4Article in journal (Refereed)
  • 26.
    Såthe, Conny
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Ström, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Richter, Robert
    Alagia, Michele
    Stranges, Stefano
    Gorczyca, Thomas
    Robicheaux, Francis
    Double Excitations of Helium in Weak Static Electric Fields2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, p. 043002-Article in journal (Refereed)
    Abstract [en]

    A dramatic electric field dependence has been observed in the fluorescence yield spectrum of the doubly excited states in helium, where a rich phenomenology is encountered below the N=2 threshold. Fluorescence yields of certain states can be tuned to zero, while other dipole-forbidden states are significantly enhanced, for fields much weaker than 1  kV/cm. Using an R-matrix multichannel quantum defect theory, spherical-to-parabolic frame transformation method, we are able to reproduce the main features of the observed spectrum, and we discuss the qualitative behavior in terms of weak electric field mixing.

  • 27. Såthe, Conny
    et al.
    Ström, Magnus
    Agåker, Marcus
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Rubensson, Jan-Erik
    Richter, Robert
    Alagia, Michele
    Stranges, Stefano
    Gorczyca, Tom
    Robicheaux, Francis
    Double Excitations of Helium in Weak Static Electric Fields2006In: Physical Review Letters, ISSN 0031-9007, Vol. 96, p. 043002-Article in journal (Refereed)
  • 28.
    Söderström, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Richter, Robert
    Alagia, Michele
    Stranges, Stefano
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Oxygen K Edge X-ray-Emission-Threshold-Electron Coincidence Spectrum of CO22007In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 76, no 2, p. 022505-Article in journal (Refereed)
    Abstract [en]

    The oxygen K -edge x-ray-emission-threshold-electron coincidence spectrum of CO2 is presented. A two-step model, describing the result as a threshold-photoelectron spectrum free from post-collision interaction effects, predicts the salient features of the measured spectrum. Small discrepancies from the predictions are discussed in terms of threshold ionization dynamics.

  • 29.
    Söderström, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Zimina, Anna
    Feifel, Raimund
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Eisebitt, Stefan
    Follath, Rolf
    Reichardt, Gerd
    Schwarzkopf, Olaf
    Eberhardt, Wolfgang
    Mihelic, Andrej
    Zitnik, Matjaz
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Radiative decay spectra of selected doubly excited states in helium2008In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 77, no 1, p. 012513-Article in journal (Refereed)
    Abstract [en]

    Radiative decay spectra of doubly excited states in He have been measured after selective excitation with monochromatized synchrotron radiation. The decay spectra are in excellent agreement with predictions based on calculations.

  • 30.
    Söderström, Johan
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Physics II.
    Alagia, M
    Richter, R
    Stranges, S
    Agåker, Marcus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Physics II.
    Ström, Magnus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Physics II.
    Sorensen, Stacey
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Physics II.
    X-ray-emission-threshold-electron coincidence spectroscopy2004In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 141, no 2-3, p. 161-170Article in journal (Refereed)
  • 31.
    Söderström, Johan
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Gråsjö, Johan
    Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Pharmacy.
    Kashtanov, S
    Bergström, Christel
    Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Pharmacy.
    Agåker, Marcus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Schmitt, Thorsten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Augustsson, Andreas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Duda, Laurent
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Guo, Jinghua
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Luo, Yi
    Artursson, Per
    Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Pharmacy.
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    X-ray yield and selectively excited X-ray emission spectra of atenolol and nadolol.2005In: J Electr Spectr, Vol. 144-147, p. 283-285Article in journal (Refereed)
  • 32.
    Terschlüsen, Joachim Andreas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Svanqvist, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Plogmaker, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Siegbahn, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Measuring the temporal coherence of a high harmonic generation setup employing a Fourier transform spectrometer for the VUV/XUV2014In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 768, p. 84-88Article in journal (Refereed)
    Abstract [en]

    In this experiment we used an 800 nm laser to generate high-order harmonics in a gas cell filled with Argon. Of those photons, a harmonic with 42 eV was selected by using a time-preserving grating monochromator. Employing a modified Mach–Zehnder type Fourier transform spectrometer for the VUV/XUV it was possible to measure the temporal coherence of the selected photons to about 6 fs. We demonstrated that not only could this kind of measurement be performed with a Fourier transform spectrometer, but also with some spatial resolution without modifying the XUV source or the spectrometer.

  • 33.
    Urpelainen, Samuli
    et al.
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Sathe, Conny
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Grizolli, Walan
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Head, Ashley R.
    Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Andersson, Margit
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Huang, Shih-Wen
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Jensen, Brian N.
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Wallen, Erik
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden.;Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA..
    Tarawneh, Hamed
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Sankari, Rami
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Nyholm, Ralf
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Lindberg, Mirjam
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Sjoblom, Peter
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    Johansson, Niclas
    Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Reinecke, Benjamin N.
    Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Arman, M. Alif
    Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Merte, Lindsay R.
    Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Knudsen, Jan
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden.;Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Schnadt, Joachim
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden.;Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Andersen, Jesper N.
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden.;Lund Univ, Dept Phys, Div Synchrotron Radiat Res, POB 118, S-22100 Lund, Sweden..
    Hennies, Franz
    Lund Univ, MAX Lab 4, POB 118, SE-22100 Lund, Sweden..
    The SPECIES beamline at the MAX IV Laboratory: a facility for soft X-ray RIXS and APXPS2017In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 24, p. 344-353Article in journal (Refereed)
    Abstract [en]

    SPECIES is an undulator-based soft X-ray beamline that replaced the old I511 beamline at the MAX II storage ring. SPECIES is aimed at high-resolution ambient-pressure X-ray photoelectron spectroscopy (APXPS), near-edge X-ray absorption fine-structure (NEXAFS), X-ray emission spectroscopy (XES) and resonant inelastic X-ray scattering (RIXS) experiments. The beamline has two branches that use a common elliptically polarizing undulator and monochromator. The beam is switched between the two branches by changing the focusing optics after the monochromator. Both branches have separate exit slits, refocusing optics and dedicated permanent endstations. This allows very fast switching between two types of experiments and offers a unique combination of the surface-sensitive XPS and bulk-sensitive RIXS techniques both in UHV- and at elevated ambient-pressure conditions on a single beamline. Another unique property of the beamline is that it reaches energies down to approximately 27 eV, which is not obtainable on other current APXPS beamlines. This allows, for instance, valence band studies under ambient-pressure conditions. In this article the main properties and performance of the beamline are presented, together with selected showcase experiments performed on the new setup.

  • 34.
    Yin, Z.
    et al.
    DESY, Photon Sci, D-22607 Hamburg, Germany.;Max Planck Inst Biophys Chem, Struct Dynam Biochem Syst, D-37077 Gottingen, Germany..
    Peters, H. B.
    DESY, ZM1, D-22607 Hamburg, Germany..
    Hahn, U.
    DESY, Photon Sci, D-22607 Hamburg, Germany..
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Hage, A.
    DESY, Photon Sci, D-22607 Hamburg, Germany.;Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland..
    Reininger, R.
    Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA..
    Siewert, F.
    Helmholtz Zentrum Berlin, Inst Nanometre Opt & Technol, D-12489 Berlin, Germany..
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Viefhaus, J.
    DESY, Photon Sci, D-22607 Hamburg, Germany..
    Techert, S.
    DESY, Photon Sci, D-22607 Hamburg, Germany.;Max Planck Inst Biophys Chem, Struct Dynam Biochem Syst, D-37077 Gottingen, Germany.;Univ Gottingen, Inst Xray Phys, D-37077 Gottingen, Germany..
    A new compact soft x-ray spectrometer for resonant inelastic x-ray scattering studies at PETRA III2015In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 86, no 9, article id 093109Article in journal (Refereed)
    Abstract [en]

    We present a newly designed compact grating spectrometer for the energy range from 210 eV to 1250 eV, which would include the K alpha(1,2) emission lines of vital elements like C, N, and O. The spectrometer is based on a grazing incidence spherical varied line spacing grating with 2400 l/mm at its center and a radius of curvature of 58 542 mm. First, results show a resolving power of around 1000 at an energy of 550 eV and a working spectrometer for high vacuum (10(-4) mbar) environment without losing photon intensity.

1 - 34 of 34
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