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  • 51. Gerasimov, G N
    et al.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Maleshin, M N
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Kuhn, T K
    Sundberg, P
    Radiation amplification by a hydrogen plasma2002In: Optics and Spectroscopy, Vol. 92, no 3, p. 475-480Article in journal (Refereed)
  • 52. Gerasimov, G N
    et al.
    Krylov, B E
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Morozov, A O
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Stimulated emission of inert gas mixtures in the VUV range: Optics and Spectroscopy2002In: Optics and Spectroscopy: Optics and Spectroscopy, Vol. 92, no 2, p. 290-297Article in journal (Refereed)
  • 53. Gerasimov, G N
    et al.
    Krylov, B E
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Morozov, A O
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Vacuum ultraviolet spectra of heteronuclear dimers of inert gases in a direct-current discharge: Optics and Spectroscopy2003In: Optics and Specroscopy: Optics and Specroscopy, Vol. 94, no 3, p. 374-383Article in journal (Refereed)
  • 54.
    Gerasimov, G. N.
    et al.
    SI Vavilov State Opt Inst, All Russia Res Ctr, St Petersburg 199034, Russia.
    Krylov, B. E.
    SI Vavilov State Opt Inst, All Russia Res Ctr, St Petersburg 199034, Russia.
    Hallin, Reinhold
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Arnesen, Arne
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Parameters of VUV radiation from a DC capillary discharge in a mixture of krypton with xenon2006In: Optics and Spectroscopy, ISSN 0030-400X, E-ISSN 1562-6911, Vol. 100, no 6, p. 825-829Article in journal (Refereed)
    Abstract [en]

    This paper describes the technique and the results of measurement of the power and geometry of the VUV radiation beam from a dc capillary discharge in a mixture of krypton and xenon. The angular divergence of narrowband VUV radiation of the heteronuclear KrXe* molecule is shown to be narrower as compared to that of the discharge radiation in the range 200-1000 nm. The power of VUV radiation from a discharge tube 80 cm long is found to exceed 10 mW.

  • 55.
    Gerasimov, G N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Krylov, B E
    Kononova, O N
    Hallin, Reinhold
    Department of Physics and Materials Science, Physics II.
    Morozov, Andrei
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Zhukova, E V
    The effect of short-wavelength discharge radiation on the transmission of a magnesium fluoride window2002In: Journal of Optical Technology: Journal of Optical Technology, Vol. 69, no 3, p. 158-162Article in journal (Refereed)
  • 56. 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.

  • 57.
    Guo, J H
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Lou, Y
    Augustsson, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Kashtanov, S
    Rubensson, J E
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Shuh, D K
    Ågren, H
    Nordgren, J
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Molecular structure of alcohol-water mixtures2003In: Physical Review Letters, Vol. 91, no 15Article in journal (Refereed)
  • 58.
    Guo, J H
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Luo, Yi
    Augustsson, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. 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, Physics I.
    Rubensson, J E
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. 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, Physics I.
    Såthe, C
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. 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, Physics I.
    Ågren, H
    Siegbahn, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. 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, Physics I.
    Nordgren, J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. 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, Physics I.
    X-ray emission spectroscopy of hydrogen bonding and electronic structure of liquid water2005In: Physical Review Letters, Vol. 89, no 13Article in journal (Refereed)
  • 59.
    Guo, J H
    et al.
    Fysik II.
    Vayssieres, L
    Persson, C
    Ahuja, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV. Fysik IV.
    Johansson, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV. Fysik IV.
    Nordgren, J
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV. Fysik II.
    Polarization-dependent soft-x-ray absorption of highly oriented ZnO microrod arrays2002In: Journal of Physics-Condensed Matter, Vol. 14, no 28, p. 6969-6974Article in journal (Refereed)
  • 60. Guo, Jinghua
    et al.
    Augustsson, Andreas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Chemistry, Department of Materials Chemistry, Structural Chemistry. Department of Physics and Materials Science, Physics II.
    Kashtanov, S
    Spångberg, Daniel
    Chemistry, Department of Materials Chemistry, Structural Chemistry. Department of Physics and Materials Science, Physics II. strukturkemi.
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Chemistry, Department of Materials Chemistry, Structural Chemistry. Department of Physics and Materials Science, Physics II.
    Hermansson, Kersti
    Chemistry, Department of Materials Chemistry, Structural Chemistry. Department of Physics and Materials Science, Physics II. strukturkemi.
    Luo, Yi
    The interaction of cations and liquid water studied by resonant soft-X-ray absorption and emission spectroscopy2005In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 144-147, p. 287-290Article in journal (Refereed)
    Abstract [en]

    We report the soft-X-ray absorption and emission studies of NaCl, MgCl2, and AlCl3 in water solutions. The influences of cations on the water molecular structure can be seen as the absorption threshold edge shifted to high energy in the X-ray absorption spectra; the mixing of molecular orbital in 3a1 symmetry is reinforced as the intensity of 3a1 is further reduced; and the 1b1-emission peak shows the broadening and shift differently for Na+, Mg2+, and Al3+ water solutions, which indicates that the charge difference of the cations may not be the only playing role being responsible to the interactions between the cations and water molecules.

  • 61. Guo, Jinghua
    et al.
    Luo, Yi
    Augustsson, Andreas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Kashtanov, S
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Shuh, D
    Zhuang, V
    Ross, P
    Ågren, Hans
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    The molecular structure of alcohol-water mixtures determined by soft-X-ray absorption and emission spectroscopy2004In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 137-40, no SI, p. 425-428Article in journal (Refereed)
  • 62. Guo, Jinghua
    et al.
    Vayssieres, L
    Persson, C
    Ahuja, Rajeev
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics IV. Physics II.
    Johansson, Börje
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics IV. Physics II.
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics IV. Physics II.
    Polarization-dependent soft-x-ray absorption of a highly oriented ZnO microrod-array2005In: Journal of Physics-Condensed Matter, ISSN 1361-648X, Vol. 17, no 1, p. 235-240Article in journal (Refereed)
    Abstract [en]

    We report the soft-X-ray absorption and emission studies of NaCl, MgCl2, and AlCl3 in water solutions. The influences of cations on the water molecular structure can be seen as the absorption threshold edge shifted to high energy in the X-ray absorption spectra; the mixing of molecular orbital in 3a1 symmetry is reinforced as the intensity of 3a1 is further reduced; and the 1b1-emission peak shows the broadening and shift differently for Na+, Mg2+, and Al3+ water solutions, which indicates that the charge difference of the cations may not be the only playing role being responsible to the interactions between the cations and water molecules.

  • 63. Hellgren, N
    et al.
    Guo, Jinghua
    Luo, Yi
    Såthe, Conny
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Agui, Akane
    Kashtanov, S
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Ågren, Hans
    Sundgren, J E
    Electronic structure of carbon nitride thin films studied by X-ray spectroscopy techniques2005In: Thin Solid Films, Vol. 471, no 1-2, p. 19-34Article in journal (Refereed)
  • 64.
    Hernandez, Francisco
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    El-Daoushy, Farid
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Accounting for incomplete charge collection in Monte Carlo simulations of the efficiency of well-type Ge-detectors2003In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 498, no 1-3, p. 340-351Article in journal (Refereed)
    Abstract [en]

    The influence of the process of incomplete charge collection on the performance properties of HPGe well-type detectors is studied. A simplified sub-routine, that takes into account the total collection time of charges within the Ge-crystal, has been developed and coupled to the Monte Carlo photopeak efficiency. Only the manufacturer's data of the detector's geometry and the detector's operating voltage was used in the sub-routine. The corrected photopeak efficiency simulations, as based on this new sub-routine, showed much better agreement with the experimental data, especially for energies above 40 keV. The ratio between the experimental and simulated efficiency at 1460 keV were, for example, improved from 0.73 to 0.96 after performing these corrections on our largest well-type Ge-detector.

  • 65.
    Hernandez, Francisco
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    El-Daoushy, Farid
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Photon sources with minimized absorption for the calibration of semiconductor detectors2002In: Nuclear Instruments & Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, Vol. 488, no 1-2, p. 258-261Article in journal (Refereed)
  • 66.
    Hernandez, Francisco
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    El-Daoushy, Farid
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Semi-empirical method for self-absorption correction of photons with energies as low as 10 keV in environmental samples2002In: Nuclear Instruments & Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, Vol. 484, no 1-3, p. 625-641Article in journal (Refereed)
  • 67.
    Hernandez, Francisco
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Hernandez-Armas, J
    Catalan, A
    Fernandez-Aldecoa, J C
    Karlsson, L
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Gross alpha, gross beta activities and gamma emitting radionuclides composition of airborne particulate samples in an oceanic island2005In: Atmospheric Environment, Vol. 39, no 22, p. 4057-4066Article in journal (Refereed)
  • 68. Hjelte, I.
    et al.
    Fanis, A. De
    Carravetta, V.
    Saito, N.
    Kitajima, M.
    Tanaka, H.
    Yoshida, H.
    Hyraya, A.
    Koyano, I.
    Karlsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Svensson, Svante
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Ueda, K.
    Piancasteeli, Maria Novella
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Angular distribution of different vibrational components of the X- and B-states reached after resonant Auger decay of core-excited H2O: Experiment and Theory2005In: J. Chem. Phys., Vol. 122, p. 084306-Article in journal (Refereed)
  • 69. Holland, D M P
    et al.
    Karlsson, L
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics I. Physics II. Fysik II.
    Siegbahn, K
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics I. Physics II. Fysik I.
    A reinvestigation of the vibrational structure and the orbital assignments in the photoelectron bands of cyclopropane2002In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 125, no 1, p. 57-68Article in journal (Refereed)
  • 70. Holland, D M P
    et al.
    Karlsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    A study of the valence shell photoionisation dynamics of CH3CN and CF3CN2006In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 150, no 1, p. 47-55Article in journal (Refereed)
  • 71. Holland, D M P
    et al.
    Potts, A W
    Karlsson, L
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Physics II. Fysik II.
    Trofimov, A B
    Schirmer, J
    The influence of shape resonance phenomena on the valence shell photoionization dynamics of silicon tetrafluoride2002In: Journal of Physics B-Atomic Molecular and Optical Physics, Vol. 35, no 7, p. 1741-1757Article in journal (Refereed)
  • 72. Holland, D M P
    et al.
    Potts, A W
    Trofimov, A B
    Breidbach, J
    Schirmer, J
    Feifel, Raimund
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Richter, T
    Godehusen, K
    Martins, M
    Tutay, A
    Yalcinkaya, M
    Al-Hada, M
    Eriksson, S
    Karlsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    An experimental and theoretical study of the valence shell photoelectron spectrum of tetrafluoromethane2005In: Chemical Physics, Vol. 308, no 1-2, p. 43-57Article in journal (Refereed)
  • 73. Holland, D M P
    et al.
    Powis, I
    Karlsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Trofimov, A G
    Schirmer, J
    von Niessen, W
    A study of the photoionisation dynamics of the cyanogen halides2004In: Chemical Physics, Vol. 297, no 1-3, p. 55-Article in journal (Refereed)
  • 74. Holland, D. M. P.
    et al.
    Powis, I.
    Öhrwall, Gunnar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Karlsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    von Niessen, W.
    A study of the photoionisation dynamics of chloromethane and iodomethane2006In: Chemical Physics, Vol. 326, p. 535-550Article in journal (Refereed)
    Abstract [en]

    Angle resolved valence shell photoelectron spectra of chloromethane and iodomethane have been recorded using synchrotron radiation in the photon energy range 14–120 eV. These have allowed photoelectron angular distributions and branching ratios to be determined not only for the main bands associated with the single-hole states but also for the satellite structure due to many-electron effects. The continuum multiple scattering approach has been used to calculate photoelectron asymmetry parameters and branching ratios for the valence orbitals of CH3Cl and CH3I, and also for the I 4d subshell. A comparison between the experimental data and the theoretical predictions has enabled the influence of Cooper minima, shape resonances and intershell coupling to be assessed. The asymmetry parameters and branching ratio for the spin–orbit split components of the CH3I+ X~2E state have been measured and exhibit a spectral behaviour almost identical to that of the corresponding data for the Xe 5p3/2 and 5p1/2 levels. The many-body Green’s function approach has been employed to evaluate the ionisation energies and spectral intensities of all valence states and the results have facilitated an interpretation of the satellite structure. The I 4d shake-up, shake-off and Auger spectra of iodomethane have been recorded and many of the Auger peaks have been assigned using previously determined ionisation energies of doubly charged valence states.

  • 75.
    Ingrid U, Olsson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Physics II.
    The importance of knowing the origin of samples in dating1993In: PACT, Vol. 38, p. 211-222Article in journal (Refereed)
  • 76. JOHANSSON, E
    et al.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Physics, Department of Physics and Materials Science, Physics II. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. oorganisk kemi.
    Carlsson, Jan-Otto
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Physics, Department of Physics and Materials Science, Physics II. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. oorgansik kemi.
    DIAMOND NUCLEATION ON HEXAGONAL BORON-NITRIDE - AN AB-INITIO STUDY OF ENERGETICS1995In: JOURNAL OF PHYSICAL CHEMISTRY, ISSN 0022-3654, Vol. 99, no 34, p. 12781-12785Article in journal (Other scientific)
    Abstract [en]

    The nucleation of diamond on the zigzag and armchair edge atoms of the basal plane of hexagonal boron nitride (h-BN) has been investigated theoretically by using ab initio molecular orbital theory. The calculations have included the effects of electron co

  • 77. Jungner, Högne
    et al.
    Olsson, Ingrid U.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Scott, E. Marian
    Obituary: Reidar Nydal (1926-2004) in Radiocarbon, Vol 36, Issue 3, pp ix-xi2004Other (Other (popular science, discussion, etc.))
  • 78. Kashtanov, S
    et al.
    Augustsson, Andreas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics I. Physics II.
    Luo, Yi
    Guo, J H
    Såthe, Conny
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics I. Physics II.
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics I. Physics II.
    Siegbahn, Hans
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics I. Physics II.
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics I. Physics II.
    Ågren, Hans
    Local structures of liquid water studied by x-ray emission spectroscopy2004In: Physical Review B, Vol. 69, no 2Article in journal (Refereed)
  • 79. Kashtanov, S
    et al.
    Augustsson, Andreas
    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.
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Ågren, Hans
    Guo, Jinghua
    Luo, Yi
    Chemical and electronic structures of liquid methanol from x-ray emission spectroscopy and density functional theory2005In: Physical Review B, Vol. 71, no 10Article in journal (Refereed)
  • 80. Kashtanov, S
    et al.
    Zhuang, G R V
    Augustsson, Andreas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Luo, Yi
    Ross, P N
    Guo, J H
    Structural conformation in a poly(ethylene oxide) film determined by X-ray emission spectroscopy2007In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 111, no 40, p. 11658-11661Article in journal (Refereed)
    Abstract [en]

    The electronic structure of pol(ethylene oxide) (PEO) in a thin (<1 μ) film sample was experimentally probed by X-ray emission spectroscopy. Both nonresonant and resonant X-ray emission spectra were simulated by using density functional theory (DFT) applied to four different models representing different conformations in the polymer. Calculated spectra were compared with experimental results for the PEO film. It was found that the best fit was obtained with the polymer conformation in PEO electrolytes from which the salt (LiMF6, M = P, As, or Sb) had been removed. This conformation is different from the crystalline bulk polymer and implies that film casting, commonly used to form electrolytes for Li polymer batteries, induces the same conformation in the polymer not depending upon the presence of salt.

  • 81.
    Khodorkovskii, M. A.
    et al.
    Russian Sci Ctr Appl Chem, St Petersburg 197198, Russia.
    Belyaeva, A. A.
    Russian Sci Ctr Appl Chem, St Petersburg 197198, Russia.
    Rakcheeva, L. P.
    Russian Sci Ctr Appl Chem, St Petersburg 197198, Russia.
    Artamonova, T. O.
    Russian Sci Ctr Appl Chem, St Petersburg 197198, Russia.
    Serdobintsev, P. Y.
    St Petersburg State Univ, St Petersburg 198904, Russia.
    Pastor, A. A.
    St Petersburg State Univ, St Petersburg 198904, Russia.
    Kozlov, A. S.
    St Petersburg State Univ, St Petersburg 198904, Russia.
    Murashov, S. V.
    St Petersburg State Univ, St Petersburg 198904, Russia.
    Devdariani, A. Z.
    St Petersburg State Univ, St Petersburg 198904, Russia.
    Hallin, Reinhold
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Siegbahn, Kai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Multiphoton mass spectra of Xe-2 molecules in the range of excited Xe*(6p, 5d) atoms2006In: Optics and Spectroscopy, Vol. 100, no 4, p. 497-509Article in journal (Refereed)
    Abstract [en]

    The (2 + 1) photoionization mass spectra of Xe-2 molecules are studied in a supersonic jet upon excitation by laser radiation in the energy range 80321.3-77821 cm(-1), corresponding to the dissociation of the Xe-2 molecule into atoms Xe(S-1(0)) + Xe*(6p, 5d). Several vibrational progressions are observed, which are attributed to two-photon transitions of Xe-2 from the ground state to the excited states of the 0(g)(+), 1(g), and 2(g) symmetries. Based on the analysis of these progressions, the molecular constants of a number of excited states of Xe? are estimated.

  • 82. Kjeldgaard, Lisbeth
    et al.
    Käämbre, Tanel
    Schiessling, Joachim
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Marenne, J.
    O´Shea, J. N.
    Schnadt, Joachim
    Glover, C. J.
    Nagasono, M.
    Nordlund, Dennis
    Garnier, M. G.
    Qian, Limin
    Rubensson, Jan-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Rudolf, P.
    Mårtensson, Nils
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics V. Physics II.
    Brühwiler, Paul
    Department of Physics and Materials Science, Physics V. Physics II.
    Intramolecular vibronic dynamics in molecular solids: C-602005In: Physical Review B, Vol. 72, no 20, p. 205414-15Article in journal (Refereed)
  • 83. Kottirsch, G
    et al.
    Koch, G
    Feifel, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Fysik II.
    beta-aryl-suceinic acid hydroxamates as dual inhibitors of matrix metalloproteinases and tumor necrosis factor alpha converting enzyme2002In: Journal of Medicinal Chemistry, Vol. 45, no 11, p. 2289-2293Article in journal (Refereed)
  • 84. Krylov, B
    et al.
    Morozov, A
    Gerasimov, G
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Hallin, Reinhold
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Channels of energy transfer to atomic nitrogen in excited argon-nitrogen mixtures2002In: Journal of Physics B Atomic Molecular and Optical Physics: Journal of Physics B, Vol. 35, no 20, p. 4257-4270Article in journal (Refereed)
  • 85. Kurmaev, E Z
    et al.
    Moewes, A
    Butorin, S
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Katsnelson, M I
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Finkelstein, L D
    Nordgren, J
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics IV.
    Tedrow, P M
    Half-metallic electronic structure of CrO2 in resonant scattering2003In: Physical Review B, Vol. 67, no 15, p. 155105-Article in journal (Refereed)
  • 86. Kuznetsova, T V
    et al.
    Yablonskikh, M V
    Postnikov, A V
    Nicolay, G
    Eltner, B
    Reinert, F
    Yarmoshenko, Y M
    Titov, A N
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Electron structure of 1T-TiTe2 intercalated with Cr based on ARPES, RXES and XAS data2004In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 137-40, no SI, p. 481-485Article in journal (Refereed)
  • 87.
    Kvashnina, K.O.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Butorin, S.M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Modin, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Werme, L
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Nordgren, J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Guo, J.-H.
    Berger, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Electronic structure of complex copper systems probed by resonant inelastic X-ray scattering at Cu L3 edge2009In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 404, no 20, p. 3559-3566Article in journal (Refereed)
    Abstract [en]

    We have used X-ray absorption (XA) and resonant inelastic X-ray scattering (RIXS) spectroscopies to study a series of copper compounds, namely Cu2O, CuO, Cu(OH)2, CuCl2, Cu2S, CuSO4, malachite (Cu2(CO3)2(OH)2) and atacamite (CuCl2·3Cu(OH)2). Cu 2p XA spectra provide information about oxidation states. Divalent copper gives a single narrow line due to excitations into the empty 3d state, whereas monovalent copper gives a broad band at higher energy due to transitions to 4s states. Chemical shifts of the main line in the Cu2+ XA spectra of different compounds are observed but in some cases they are too small to make a clear distinction between the species. It is shown that RIXS at the Cu 2p edge has a great potential to distinguish between the species due to large differences in spectral shapes for the same energy of the incident photon beam. First evidence for the possibility of detecting chemical composition of copper compounds is presented and discussed in details.

  • 88.
    Kvashnina, Kristina
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Butorin, Sergei
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Modin, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Soroka, Inna
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Marcellini, Moreno
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Guo, Jinghua
    Werme, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Changes in electronic structure of copper films in aqueous solutions2007In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 19, no 22, p. 226002-Article in journal (Refereed)
    Abstract [en]

    The possibilities for using x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS) to probe the Cu oxidation state and changes in the electronic structure during interaction between copper and ground-water solutions were examined. Surface modifications induced by chemical reactions of oxidized 100 Å Cu films with Cl, SO42− and HCO3 ions in aqueous solutions with various concentrations were studied in situ using liquid cells. Copper corrosion processes in ground water were monitored for up to nine days. By comparing Cu 2p–3d, 4s transitions for a number of reference substances previously measured, changes in electronic structure of the Cu films were analysed. The XAS and RIXS spectral shape at the Cu edge, the chemical shift of the main line for Cu2+, and the energy positions of the observed satellites served as a tool for monitoring the changes during the reaction. It was found that the pH value and the Cl concentration in solutions strongly affect the speed of the corrosion reaction.

  • 89.
    Kvashnina, Kristina
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics III.
    Butorin, Sergei
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics III.
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics III.
    Guo, Jinghua
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics III.
    Hjörvarsson, Björgvin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II. Physics III.
    Electronic structure of Gd hydrides studied by resonant Inelastic soft X-ray scattering2004In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 137-140, p. 487-489Article in journal (Refereed)
  • 90.
    Kvashnina, Kristina O.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Butorin, Sergei M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Modin, A.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Soroka, Inna
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Marcellini, Moreno
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Guo, J-H
    Werme, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    In situ X-ray absorption study of copper films in ground water solutions2007In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 447, no 1-3, p. 54-57Article in journal (Refereed)
    Abstract [en]

    This study illustrates how the damage from copper corrosion can be reduced by modifying the chemistry of the copper surface environment. The surface modification of oxidized copper films induced by chemical reaction with Cl− and in aqueous solutions was monitored by in situ X-ray absorption spectroscopy. The results show that corrosion of copper can be significantly reduced by adding even a small amount of sodium bicarbonate. The studied copper films corroded quickly in chloride solutions, whereas the same solution containing 1.1 mM prevented or slowed down the corrosion processes.

  • 91.
    Käämbre, Tanel
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Schiessling, Joachim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Kjeldgaard, Lisbeth
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Qian, Limin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Marenne, I.
    O´Shea, James N.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Schnadt, Joachim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Nordlund, Dennis
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Glover, C. J.
    Rubensson, Jan-Erik
    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.
    Rudolf, P.
    Mårtensson, Nils
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Brühwiler, Paul A.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Bulk electronic structure of K3C60 as revealed by soft x-rays2007In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 19, p. 195432-Article in journal (Refereed)
    Abstract [en]

    We present C 1s x- ray absorption, x- ray emission, and resonant inelastic x- ray scattering (RIXS ) spectra of single- phase crystalline K3C60. The comparison to valence- band photoelectron spectra from the same sample facilitates identification of the contribution from surface and bulk electronic states in the latter. Bulk- sensitive techniques show that the valence bands of K3C60 and pure C-60 are characterized by spectral features of similar width, in agreement with the predictions of band- structure calculations. Symmetry selectivity in the RIXS process allows us to assign peaks in the C 1s absorption spectrum, demonstrating a close correspondence with pure C-60 also in the conduction band. The symmetry selectivity is as pronounced in K3C60 as in pure C-60, indicating that the local C-60 symmetry is not appreciably affected by the K doping, either in the ground state or intermediate state, on the time scale of 6 fs.

  • 92. Larsen, G
    et al.
    Vilmundardóttir, E G
    Olsson, Ingrid U
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    The Hekla-3 tephra in Iceland, characteristics, age determinations and effects on the environment2004In: The 6th Nordic Geological Winter Meeting, 6-9 January 2004, Uppsala, 2004, p. 137-Conference paper (Refereed)
  • 93.
    Lindblad, Andreas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Fink, R. F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Bergersen, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Lundwall, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Rander, Torbjörn
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Feifel, Reimund
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Öhrwall, Gunnar
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Tchaplyguine, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Hergenhahn, U.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Svensson, Svante
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Björneholm, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
    Post-Collision Interaction in Noble Gas Clusters; Observation of Differences in Surface and Bulk Lineshapes2005In: J. Chem. Phys., Vol. 123, p. 21101-Article in journal (Refereed)
  • 94. Lucchese, Robert
    et al.
    Söderström, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Tanaka, Takahiro
    Hoshino, Masaki
    Kitajima, Masashi
    Tanaka, Hiroshi
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Ueda, Kiyoshi
    Vibrationally resolved partial cross sections and asymmetry parameters for nitrogen K-shell photoionization of the N2O molecule2007In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 76, no 1, p. 012506-Article in journal (Refereed)
    Abstract [en]

    We have measured the vibrationally resolved partial cross sections σ(v1,v2,v3) and asymmetry parameters β(v1,v2,v3) for Nc and Nt K-shell photoionization of the N2O molecule in the σ* shape resonance region above the Nt and Nc K-shell ionization thresholds. Nc K-shell photoionization of the N2O molecule predominantly causes the excitation of the quasisymmetric vibrations (v1), whereas Nt K-shell photoionization causes both quasisymmetric and quasiantisymmetric vibrations (v1 and v3) to be excited. The shape resonance energy in the Nc K-shell photoionization increases with an increase in v1. The β(v1,0,0) curves for the Nc K-shell photoionization exhibit maxima at energies close to the shape resonance energies for the individual values of v1. The shape resonance energy in the Nt K-shell photoionization decreases with an increase in v1 and slightly increases with an increase in v3. The β(v1,0,0) curves show a significant state dependence in the region of the shape resonance, with the curves shifting to lower energy as v1 increases. The vibrational state dependence of the cross sections σ(v1,v2,v3) and asymmetry parameters β(v1,v2,v3) are well reproduced by the theoretical calculations using the multichannel Schwinger configuration interaction (MCSCI) method, including both the Nc and Nt ion states.

  • 95.
    Magnuson, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Investigation of Ti2AlC and TiC by soft x-ray emission spectroscopy2007In: Proceedings of the international conference on nanoscience and technology / [ed] Meyer E., Hegner M., Gerber C., Guntherodt H.J., 2007, Vol. 61, p. 760-764Conference paper (Other academic)
    Abstract [en]

    The electronic structure of the MAX-phase Ti2AlC was investigated by soft x-ray emission spectroscopy. This nanolaminated carbide compound represents a class of layered materials with a combination of properties from both metals and ceramics. The bulk-sensitive soft x-ray emission technique is shown to be particularly useful for detecting detailed electronic structure information about internal monolayers and interfaces. The Ti-Al bonding is manifested by a pronounced peak in the Ti L-emission of Ti2AlC, which is not present in the binary TiC system. The spectral shape of Al L-emission in the MAX-phase is strongly modified in comparison to metallic Al. By replacing the constituting elements, a change of the electron population can be achieved causing a change of covalent bonding between the laminated layers, which enables control of the macroscopic properties of the material.

  • 96.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Butorin, Sergei
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Agui, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Resonant soft X-ray Raman scattering of NiO2002In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 14, no 13, p. 3669-3676Article in journal (Refereed)
    Abstract [en]

    Resonant soft x-ray Raman scattering measurements on NiO have been made at photon energies across the Ni 2p absorption edges. The details of the spectral features are identified as Raman scattering due to d-d and charge-transfer excitations. The spectra are interpreted within the single-impurity Anderson model, including multiplets, crystal-field and charge-transfer effects. At threshold excitation, the spectral features consists of triplet-triplet and triplet-singlet transitions of the 3d8 configuration. For excitation energies corresponding to the charge-transfer region in the Ni 2p x-ray absorption spectrum of NiO, the emission spectra are instead dominated by charge-transfer transitions to the 3d9\underline L-1 final state. Comparisons of the final states with other spectroscopical techniques are also made.

  • 97.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Butorin, Sergei
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Guo, J H
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Electronic structure investigation of CoO by means of soft x-ray scattering2002In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 65, no 20, p. 205106-Article in journal (Refereed)
    Abstract [en]

    The electronic structure of CoO is studied by resonant inelastic soft x-ray scattering spectroscopy using photon energies across the Co 2p absorption edges. The different energy-loss structures in the Raman scattering spectra are identified as due to d-d and charge-transfer excitations. For excitation energies close to the L3 resonance, the spectral features are dominated by quartet-quartet and quartet-doublet transitions of the 3d7 configuration. At excitation energies corresponding to the satellites in the Co 2p x-ray-absorption spectrum of CoO, the emission features are instead dominated by charge-transfer transitions to the 3d8-1 final state. The spectra are interpreted and discussed with the support of simulations within the single-impurity Anderson model with full multiplet effects which are found to yield consistent spectral functions to the experimental data.

  • 98.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Butorin, Sergei
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Såthe, Conny
    Nordgren, Joseph
    Ravindran, P
    Spin transition in LaCoO3 investigated by resonant soft X-ray emission spectroscopy2004In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 68, no 2, p. 289-295Article in journal (Refereed)
    Abstract [en]

    The spin transition in LaCoO3 is investigated by temperature-dependent resonant soft X-ray emission spectroscopy near the Co 2p absorption edges. This element-specific technique is more bulk sensitive with respect to the temperature-induced spin state of the Co3+ ions in LaCoO3 than other high-energy spectroscopic methods. The spin transition is interpreted and discussed with ab initio density-functional theory within the fixed-spin moment method, which is found to yield consistent spectral functions to the experimental data. The spectral changes for LaCoO3 as a function of temperature suggest a change in spin state as the temperature is raised from 85 to 300 K, while the system remains in the same spin state as the temperature is further increased to 510 K.

  • 99.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Butorin, Sergei
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Werme, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Ivanov, Kiril
    Guo, Jinghua
    Shuh, David
    Uranium oxides investigated by X-ray absorption and emission spectroscopies2006In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 252, no 15, p. 5615-5618Article in journal (Refereed)
    Abstract [en]

    X-ray absorption and resonant X-ray emission measurements at the O 1s edge of the uranium oxides UO2, U3O8 and UO3 are presented. The spectral shapes of the O Kα X-ray emission spectra of UO3 exhibit significant excitation energy dependence, from an asymmetric to a symmetric form, which differs from those of UO2 and U3O8. This energy dependence is attributed to a significant difference in the oxygen–uranium hybridization between two different sites in the crystal structure of UO3. The spectral shapes of UO2 and U3O8 are also found to be different but without significant energy dependence. The experimental spectra of the valence and conduction bands of the uranium oxides are compared to the results of electronic structure calculations available in the literature.

  • 100.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Mattesini, Maurizio
    Höglund, Carina
    Abrikosov, Igor
    Birch, Jens
    Hultman, Lars
    Electronic structure investigation of the cubic inverse perovskite Sc3AlN2008In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 78, no 23, p. 235102-Article in journal (Refereed)
    Abstract [en]

    The electronic structure and chemical bonding of the recently discovered inverse perovskite Sc3AlN, incomparison to those of ScN and Sc metal, have been investigated by bulk-sensitive soft-x-ray emissionspectroscopy. The measured Sc L, N K, Al L1, and Al L2,3 emission spectra are compared with calculatedspectra using first-principles density-functional theory including dipole transition-matrix elements. The mainSc 3d–N 2p and Sc 3d–Al 3p chemical bond regions are identified at −4 and −1.4 eV below the Fermi level,respectively. A strongly modified spectral shape of 3s states in the Al L2,3 emission from Sc3AlN in comparisonto that for pure Al metal is found, which reflects the Sc 3d–Al 3p hybridization observed in the Al L1emission. The differences between the electronic structures of Sc3AlN, ScN, and Sc metal are discussed inrelation to the change in the conductivity and elastic properties.

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