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  • 1. Butorin, SM
    et al.
    Guo, JH
    Magnuson, Martin
    Uppsala University.
    Kuiper, P
    Nordgren, J
    Uppsala University.
    Low-energy d-d excitations in MnO studied by resonant x-ray fluorescence spectroscopy1996In: PHYSICAL REVIEW B-CONDENSED MATTER, ISSN 0163-1829, Vol. 54, no 7, 4405-4408 p.Article in journal (Other scientific)
    Abstract [en]

    We measured the Mn L(alpha,beta) x-ray fluorescence spectra of MnO excited by selected photon energies near the L(2,3) absorption edges. The resulting resonant inelastic x-ray scattering spectra probe low-lying electronic excited states, due to dd and cha

  • 2. Butorin, SM
    et al.
    Guo, JH
    Magnuson, Martin
    Uppsala University.
    Nordgren, J
    Uppsala University.
    Resonant inelastic soft-x-ray scattering from valence-band excitations in 3d(0) compounds1997In: PHYSICAL REVIEW B-CONDENSED MATTER, ISSN 0163-1829, Vol. 55, no 7, 4242-4249 p.Article in journal (Other scientific)
    Abstract [en]

    Ti and Mn L(alpha,beta) x-ray fluorescence spectra of FeTiO3 and KMnO4 were measured with monochromatic photon excitation on selected energies across the L(2,3) absorption edges. The resulting inelastic x-ray-scattering structures and their changes with v

  • 3. Butorin, SM
    et al.
    Magnuson, Martin
    Uppsala University.
    Ivanov, K
    Shuh, DK
    Takahashi, T
    Kunii, S
    Guo, JH
    Nordgren, J
    Uppsala University.
    Resonant inelastic soft-X-ray scattering at the 4d edge of Ce-based heavy-fermion materials1999In: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, ISSN 0368-2048, Vol. 103, 783-786 p.Article in journal (Other scientific)
    Abstract [en]

    Resonant X-ray scattering measurements were performed on CeB6, CeAl, gamma-Ce, and alpha-Ce at various incident-photon energies near the Ce 4d threshold. A pronounced inelastic scattering structure which has 4f character is observed at about 4 eV below th

  • 4.
    Duda, Laurent
    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.
    Schmitt, Thorsten
    Magnuson, Martin
    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.
    Forsberg, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
    Olsson, Anders
    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.
    Nordgren, Joseph
    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.
    Okada, K
    Kotani, A
    Resonant inelastic x-ray scattering at the NiO O K-resonance: non-local charge-transfer and double singlet excitations2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, no 6, 067402- p.Article in journal (Refereed)
  • 5.
    Duda, Laurent
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Schmitt, Thorsten
    Magnuson, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Forsberg, Johan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Olsson, Anders
    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.
    Okada, K
    Kotani, A
    Resonant inelastic x-ray scattering at the oxygen K resonance of NiO: Nonlocal charge transfer and double-singlet excitations2006In: Physical Review Letters, Vol. 96, no 6Article in journal (Refereed)
  • 6.
    Duda, Laurent-Claudius
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Schmitt, Thorsten
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Magnuson, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Forsberg, J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Olsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Nordgren, J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Okada, K.
    Kotani, A.
    Comment on "Resonant inelastic x-ray scattering at the oxygen K resonance of NiO: Nonlocal charge transfer and double-singlet excitations" - Reply2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, no 26, 269702Article in journal (Refereed)
  • 7.
    Fink, Reinhold
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Eschner, Annika
    Magnuson, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Björneholm, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Hjelte, Ingela
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Miron, Catalin
    Bässler, Margit
    Svensson, Svante
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Piancastelli, Maria Novella
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Sorensen, Stacey
    Specific production of very long-lived core-excited sulfur atoms by 2p(-1)sigma* excitation of the OCS molecule followed by ultrafast dissociation2006In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 39, no 12, L269-L275 p.Article in journal (Refereed)
    Abstract [en]

    A core-excited sulfur state with a lifetime almost one order of magnitude longer than in molecular 2p core-hole states is selectively produced by ultrafast dissociation of S 2p -> sigma* excited OCS. Clear evidence for this is provided by strong atomic peaks (20% of the total intensity) in x-ray fluorescence but very weak ones (2%) in the corresponding resonant Auger spectrum. Corroborating the assignment of the spectra, ab initio calculations explain the enhanced lifetime: the Auger decay of the produced D-3(3) (2p(5)3p(5)) sulfur state is strongly decreased as it contradicts a newly derived propensity rule of the L2,3MM Auger decay.

  • 8. Guo, JH
    et al.
    Magnuson, Martin
    Uppsala University.
    Sathe, C
    Uppsala University.
    Nordgren, J
    Uppsala University.
    Yang, L
    Luo, Y
    Agren, H
    Xing, KZ
    Johansson, N
    Salaneck, WR
    Daik, R
    Feast, WJ
    Resonant and nonresonant x-ray scattering spectra of some poly(phenylenevinylene)s1998In: JOURNAL OF CHEMICAL PHYSICS, ISSN 0021-9606, Vol. 108, no 14, 5990-5996 p.Article in journal (Other scientific)
    Abstract [en]

    The electronic structure of some poly(phenylenevinylene)s have been investigated by resonant and nonresonant x-ray inelastic scattering spectroscopies. The nonresonant as well as all resonant spectra for each polymer demonstrate benzene-like features, ind

  • 9.
    Hahlin, Maria
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Odelius, M
    Magnuson, Martin
    Johansson, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry.
    Plogmaker, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Hagberg, D
    Sun, L
    Siegbahn, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Rensmo, Håkan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Mapping the frontier electronic structures of triphenylamine basedorganic dyes at TiO2 interfaces2011In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 13, no 8, 3534-3546 p.Article in journal (Refereed)
    Abstract [en]

    The frontier electronic structures of a series of organic dye molecules containing a triphenylamine moiety, a thiophene moiety and a cyanoacrylic acid moiety have been investigated by photoelectron spectroscopy (PES), X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES) and resonant photoelectron spectroscopy (RPES). The experimental results were compared to electronic structure calculations on the molecules, which are used to confirm and enrich the assignment of the spectra. The approach allows us to experimentally measure and interpret the basic valence energy level structure in the dye, including the highest occupied energy level and how it depends on the interaction between the different units. Based on N 1s X-ray absorption and emission spectra we also obtain insight into the structure of the excited states, the molecular orbital composition and dynamics. Together the results provide an experimentally determined energy level map useful in the design of these types of materials. Included are also results indicating femtosecond charge redistribution at the dye/TiO(2) interface.

  • 10.
    Karis, O
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Magnuson, Martin
    Wiell, T
    Weinelt, M
    Wassdahl, N
    Nilsson, A
    Martensson, N
    Holmstrom, E
    Niklasson, AMN
    Eriksson, O
    Observation of short- and long-range hybridization of a buried Cu monolayer in Ni2000In: PHYSICAL REVIEW B, ISSN 0163-1829, Vol. 62, no 24, R16239-R16242 p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure of a Cu monolayer buried in Ni fcc(100) is studied by means of x-ray emission and absorption spectroscopies in combination with first principles calculations. The local character of the x-ray probes allows us to investigate change

  • 11.
    Karis, O
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Magnuson, Martin
    Wiell, T
    Weinelt, M
    Wassdahl, N
    Nilsson, A
    Martensson, N
    Holmstrom, E
    Niklasson, AMN
    Eriksson, O
    Johansson, B
    Probing surface states of Cu/Ni thin films using x-ray absorption spectroscopy - art. no. 1134012001In: PHYSICAL REVIEW B, ISSN 0163-1829, Vol. 6311, no 11, 3401-+ p.Article in journal (Refereed)
    Abstract [en]

    Surface and interface properties of Cu thin films (1-4 monolayers) deposited on Ni(100) have been extracted by means of x-ray absorption spectroscopy and analyzed in combination with ab initio density-functional calculations. An unoccupied Cu surface stat

  • 12.
    Kurmaev, EZ
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Katsnelson, MI
    Moewes, A
    Magnuson, Martin
    Guo, JH
    Butorin, SM
    Nordgren, J
    Ederer, DL
    Iwami, M
    Spectroscopic observation of polaron-lattice band structure in the conducting polymer polyaniline2001In: JOURNAL OF PHYSICS-CONDENSED MATTER, ISSN 0953-8984, Vol. 13, no 17, 3907-3912 Language: English p.Article in journal (Refereed)
    Abstract [en]

    We present the results of soft x-ray emission measurements for undoped and protonated polyemeraldine. We show that the polaron-lattice band structure fully accounts for the observed x-ray transitions. A finite spectral intensity of C K alpha and N K alpha

  • 13.
    Magnuson, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Ti2AlC and TiC investigated by soft x-ray emission spectroscopy2006Conference paper (Other (popular scientific, debate etc.))
  • 14.
    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, 3669-3676 p.Article 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.

  • 15.
    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, 205106- p.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.

  • 16.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Butorin, Sergei M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Guo, JH
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Agui, A
    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.
    Ogasawara, H
    Kotani, A
    Takahashi, T
    Kunii, S
    Electronic-structure investigation of CeB6 by means of soft-x-ray scattering2001In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 63, no 7, 075101- p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure of the heavy fermion compound CeB6 is probed by resonant inelastic soft-x-ray scattering using photon energies across the Ce 3d and 4dabsorption edges. The hybridization between the localized 4f orbitals and the delocalized valence-band states is studied by identifying the different spectral contributions from inelastic Raman scattering and normal fluorescence. Pronounced energy-loss structures are observed below the elastic peak at both the 3d and 4dthresholds. The origin and character of the inelastic scattering structures are discussed in terms of charge-transfer excitations in connection to the dipole allowed transitions with 4f character. Calculations within the single-impurity Anderson model with full multiplet effects are found to yield consistent spectral functions to the experimental data.

  • 17.
    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, 289-295 p.Article 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.

  • 18.
    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, 5615-5618 p.Article 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.

  • 19.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Duda, Laurent
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Butorin, Sergei
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Kuiper, Pieter
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Large magnetic circular dichroism in rensonant inelastic x-ray scattering at the Mn L-edge of Mn-Zn ferrite2006In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 17, 172409- p.Article in journal (Refereed)
    Abstract [en]

    We report resonant inelastic x-ray scattering (RIXS) excited by circularly polarized x rays on Mn-Zn ferrite at the Mn L2,3 resonances. We demonstrate that crystal-field excitations, as expected for localized systems, dominate the RIXS spectra and thus their dichroic asymmetry cannot be interpreted in terms of spin-resolved partial density of states, which has been the standard approach for RIXS dichroism. We observe large dichroic RIXS at the L2 resonance which we attribute to the absence of metallic core hole screening in the insulating Mn ferrite. On the other hand, reduced L3 -RIXS dichroism is interpreted as an effect of longer scattering time that enables spin-lattice core hole relaxation via magnons and phonons occurring on a femtosecond time scale.

  • 20.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Guo, J
    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.
    Rubensson, Jan-Erik
    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.
    Glans, P
    Yang, L
    Salek, P
    Ågren, H
    Competition between decay and dissociation of core-excited carbonyl sulfide studied by x-ray scattering1999In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 59, no 6, 4281-4287 p.Article in journal (Refereed)
    Abstract [en]

    We show evidence of dissociation during resonant inelastic soft x-ray scattering. Carbon and oxygen K-shell and sulfur L-shell resonant and nonresonant x-ray emission spectra were measured using monochromatic synchrotron radiation for excitation and ionization. After sulfur L2,3→π*, σ* excitation, atomic lines are observed in the emission spectra as a consequence of competition between de-excitation and dissociation. In contrast the carbon and oxygen spectra show weaker line-shape variations and no atomic lines. The spectra are compared to results from ab initio calculations. The discussion of the dissociation paths is based on calculated potential energy surfaces and atomic transition energies.

  • 21.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Guo, JH
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Butorin, Sergei M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Agui, A
    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.
    Nordgren, Joseph
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Monkman, AP
    The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies1999In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 111, no 10, 4756-4761 p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure of the conjugated polymer, polyaniline, has been studied by resonant and nonresonant soft x-ray emission spectroscopy using synchrotron radiation for the excitation. The measurements were made on polyaniline and a few doped (protonated) phases for both the carbon and nitrogen contents. The resonant x-ray emission spectra show depletion of the π electron bands due to the selective excitation which enhances the effect of symmetry selection rules. The valence band structures in the x-ray emission spectra attributed to the π bands show unambiguous changes of the electronic structure upon protonation. By comparing to x-ray absorption measurements, the chemical bonding and electronic configuration is characterized.

  • 22.
    Magnuson, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Hague, C F
    Determination of the refractive index at soft X-ray resonances2004In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 137, 519- p.Article in journal (Refereed)
  • 23.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Theoretical Magnetism.
    Mattesini, M.
    Li, S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Höglund, C.
    Beckers, M.
    Hultman, L.
    Eriksson, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Theoretical Magnetism.
    Bonding mechanism in the nitrides Ti2AlN and TiN: An experimental and theoretical investigation2007In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 76, no 19, 195127- p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure of nanolaminate Ti2AlN and TiN thin films has been investigated by bulk-sensitive soft x-ray emission spectroscopy. The measured Ti L2,3, N K, Al L1, and Al L2,3 emission spectra are compared with calculated spectra using ab initio density-functional theory including dipole transition-matrix elements. Three different types of bond regions are identified; a relatively weak Ti 3d-Al 3p bonding between −1 and −2 eV below the Fermi level, and Ti 3d-N 2p and Ti 3d-N 2s bondings which are deeper in energy observed at −4.8 eV and −15 eV below the Fermi level, respectively. A strongly modified spectral shape of 3s states of Al L2,3 emission from Ti2AlN in comparison with pure Al metal is found, which reflects the Ti 3d-Al 3p hybridization observed in the Al L1 emission. The differences between the electronic and crystal structures of Ti2AlN and TiN are discussed in relation to the intercalated Al layers of the former compound and the change of the materials properties in comparison with the isostructural carbides.

  • 24.
    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, 235102- p.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.

  • 25.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Mattesini, Maurizio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Wilhelmsson, Ola
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Emmerlich, Jens
    Palmquist, Jens Petter
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Li, Sa
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Ahuja, Rajeev
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Hultman, L.
    Eriksson, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Jansson, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Electronic structure and chemical bonding in Ti4SiC3 investigated by soft x-ray emission spectroscopy and first-principles theory2006In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 20, 205102- p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure in the new transition-metal carbide Ti4SiC3 has been investigated by bulk-sensitive soft x-ray emission spectroscopy and compared to the well-studied Ti3SiC2 and TiC systems. The measured high-resolution Ti L, C K, and Si L x-ray emission spectra are discussed with ab initio calculations based on density-functional theory including core-to-valence dipole matrix elements. The detailed investigations of the Ti-C and Ti-Si chemical bonds provide increased understanding of the physical properties of these nanolaminates. A strongly modified spectral shape is detected for the intercalated Si monolayers due to Si 3p hybridization with the Ti 3d orbitals. As a result of relaxation of the crystal structure and the charge-transfer from Ti (and Si) to C, the strength of the Ti-C covalent bond is increased. The differences between the electronic and crystal structures of Ti4SiC3 and Ti3SiC2 are discussed in relation to the number of Si layers per Ti layer in the two systems and the corresponding change of materials properties.

  • 26.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Nilsson, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Weinelt, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Mårtensson, Nils
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Angular-dependent resonant-photoemission processes at the 2p thresholds in nickel metal1999In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 60, no 4, 2436-2440 p.Article in journal (Refereed)
    Abstract [en]

    Angle-resolved valence-band resonant-photoemission of nickel metal has been measured close to the 2p core-level thresholds with synchrotron radiation. The well-known 6-eV correlation satellite has an intensity enhancement of about two orders of magnitude at resonance. The angular dependence of the photoemission intensity has been studied as function of photon energy and provides unambiguous evidence for interference effects all the way up to the resonance maximum. The observation of different angular asymmetries, β, for the valence band and the satellite is discussed in connection to the origin of the resonant-photoemission process and the character of the satellite.  

  • 27.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Palmquist, J. P.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Mattesini, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Li, Sa
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Ahuja, Rajeev
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Condensed Matter Theory.
    Eriksson, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Theoretical Magnetism.
    Emmerlich, J.
    Wilhelmsson, Ola
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Eklund, P.
    Högberg, H.
    Hultman, Lars
    Jansson, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Electronic structure investigation of Ti3AlC2 , Ti3SiC2 , and Ti3GeC2 by soft x-ray emission spectroscopy2005In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 72, no 24, 245101- p.Article in journal (Refereed)
    Abstract [en]

    The electronic structures of epitaxially grown films of Ti3AlC2 , Ti3SiC2 , and Ti3GeC2 have been investigated by bulk-sensitive soft x-ray emission spectroscopy. The measured high-resolution Ti L , C K , Al L , Si L , and Ge M emission spectra are compared with ab initio density-functional theory including core-to-valence dipole matrix elements. A qualitative agreement between experiment and theory is obtained. A weak covalent Ti-Al bond is manifested by a pronounced shoulder in the Ti L emission of Ti3AlC2 . As Al is replaced with Si or Ge, the shoulder disappears. For the buried Al and Si layers, strongly hybridized spectral shapes are detected in Ti3AlC2 and Ti3SiC2 , respectively. As a result of relaxation of the crystal structure and the increased charge-transfer from Ti to C, the Ti-C bonding is strengthened. The differences between the electronic structures are discussed in relation to the bonding in the nanolaminates and the corresponding change of materials properties.

  • 28.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Palmquist, Jens-Petter
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Mattesini, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Li, S
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Ahuja, Rajeev
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Eriksson, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Wilhelmsson, O
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Eklund, P
    Högberg, H
    Hultman, L
    Jansson, U
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Electronic structure investigation of Ti3AlC2, Ti3SiC2, and Ti3GeC2 by soft x-ray emission spectroscopy2005In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 72, no 24, 245101- p.Article in journal (Refereed)
    Abstract [en]

    The electronic structures of epitaxially grown films of Ti3AlC2, Ti3SiC2, and Ti3GeC2 have been investigated by bulk-sensitive soft x-ray emission spectroscopy. The measured high-resolution Ti L, C K, Al L, Si L, and Ge M emission spectra are compared with ab initio density-functional theory including core-to-valence dipole matrix elements. A qualitative agreement between experiment and theory is obtained. A weak covalent Ti-Al bond is manifested by a pronounced shoulder in the Ti L emission of Ti3AlC2. As Al is replaced with Si or Ge, the shoulder disappears. For the buried Al and Si layers, strongly hybridized spectral shapes are detected in Ti3AlC2 and Ti3SiC2, respectively. As a result of relaxation of the crystal structure and the increased charge-transfer from Ti to C, the Ti-C bonding is strengthened. The differences between the electronic structures are discussed in relation to the bonding in the nanolaminates and the corresponding change of materials properties.

  • 29.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Föhlisch, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Wassdahl, N
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Nilsson, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Mårtensson, Nils
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    X-ray fluorescence spectra of metals excited below threshold2003In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 68, no 4, 045119- p.Article in journal (Refereed)
    Abstract [en]

    X-ray scattering spectra of Cu and Ni metals have been measured using monochromatic synchrotron radiation tuned from far above to more than 10 eV below threshold. Energy conservation in the scattering process is found to be sufficient to explain the modulation of the spectral shape, neglecting momentum conservation and channel interference. At excitation energies close to and above threshold, the emission spectra map the occupied local partial density of states. For the subthreshold excitations, the high-energy flank of the inelastic scattering exhibits a Raman-type linear dispersion, and an asymmetric low-energy tail develops. For excitation far below threshold the emission spectra are proportional to a convolution of the occupied and unoccupied local partial densities of states.

  • 30.
    Magnuson, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Mjukröntgenfysik.
    Rubensson, J.-E.
    Wassdahl, N
    Föhlisch, A
    Nilsson, A
    Mårtensson, N
    Resonant X-ray Raman scattering of 3d metals below threshold2003In: Physical Review B-CONDENSED MATTER, Vol. 68, 045119- p.Article in journal (Refereed)
  • 31.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Wassdahl, N.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Nilsson, A.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Föhlisch, A.
    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.
    Mårtensson, Nils
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Resonant Auger spectroscopy at the L2,3 shake-up thresholds as a probe of electron correlation effects in nickel1998In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 58, no 7, 3677-3681 p.Article in journal (Refereed)
    Abstract [en]

    The excitation energy dependence of the three-hole satellites in the L3-M45M45 andL2-M45M45 Auger spectra of nickel metal has been measured using synchrotron radiation. The satellite behavior in the nonradiative emission spectra at the L3 and L2thresholds is compared and the influence of the Coster-Kronig channel explored. The three-hole satellite intensity at the L3 Auger emission line reveals a peak structure at 5 eV above the L3 threshold attributed to resonant processes at the 2p53d9 shake-up threshold. This is discussed in connection with the 6-eV feature in the x-ray-absorption spectrum.

  • 32.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Wassdahl, Nial
    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.
    Energy dependence of Cu L2,3 satellites using synchrotron excited x-ray-emission spectroscopy1997In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 56, no 19, 12238-12242 p.Article in journal (Refereed)
    Abstract [en]

    The L2,3 x-ray emission of Cu metal has been measured using monochromatic synchrotron radiation. The self-absorption effect in the spectra is shown to be very small in our experimental geometry. From the quantitative analysis of spectra recorded at different excitation energies, the L3/L2 emission intensity ratio and the partial Auger width are extracted. High-energy satellite features on the L3 emission line are separated by a subtraction procedure. The satellite intensity is found to be slowly increasing for excitation energies between the L3, L2, and L1 core-level thresholds due to shake-up and shake-off transitions. As the excitation energy passes the L2 threshold, a step of rapidly increasing satellite intensity of the L3 emission is found due to additional Coster-Kronig processes.

  • 33.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Wilhelmsson, Ola
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Mattesini, Maurizio
    Li, Sa
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Ahuja, Rajeev
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Eriksson, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Högberg, Hans
    Hultman, Lars
    Jansson, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Anisotropy in the electronic structure of V2GeC investigated by soft x-ray emission spectroscopy and first-principles theory2008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 78, no 3, 035117- p.Article in journal (Refereed)
    Abstract [en]

    Theanisotropy of the electronic structure of ternary nanolaminate V2GeC isinvestigated by bulk-sensitive soft x-ray emission spectroscopy. The measured polarization-dependentemission spectra of V L2,3, C K, Ge M1, and Ge M2,3 in V2GeCare compared with those from monocarbide VC and pure Ge.The experimental emission spectra are interpreted with calculated spectra usingab initio density-functional theory including dipole transition matrix elements. Differenttypes of covalent chemical bond regions are revealed: V 3d-C 2p bondingat −3.8  eV, Ge 4p-C 2p bonding at −6  eV, and Ge 4p-C 2s interaction mediatedvia the V 3d orbitals at −11  eV below the Fermi level.We find that the anisotropic effects are high for the4p valence states and the shallow 3d core levels ofGe, while relatively small anisotropy is detected for the V 3dstates. The macroscopic properties of the V2GeC nanolaminate result from the chemical bonds with the anisotropic pattern as shown in this work.

  • 34.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Wilhelmsson, Ola
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Palmquist, Jens Petter
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Jansson, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Mattesini, M.
    Li, S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Ahuja, Rajeev
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Eriksson, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Electronic structure and chemical bonding in Ti2AlC investigated by soft x-ray emission spectroscopy2006In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 19, 195108- p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure of the nanolaminated transition metal carbide Ti2AlC has been investigated by bulk-sensitive soft x-ray emission spectroscopy. The measured Ti L, C K, and Al L emission spectra are compared with calculated spectra using ab initio density-functional theory including dipole matrix elements. The detailed investigation of the electronic structure and chemical bonding provides increased understanding of the physical properties of this type of nanolaminates. Three different types of bond regions are identified: The relatively weak Ti 3d-Al 3p bond 1 eV below the Fermi level and the Ti 3d-C 2p and Ti 3d-C 2s bonds which are stronger and deeper in energy are observed around 2.5 and 10 eV below the Fermi level, respectively. A strongly modified spectral shape of the 3s final states in comparison to pure Al is detected for the intercalated Al monolayers indirectly reflecting the Ti 3d-Al 3p hybridization. The differences between the electronic and crystal structures of Ti2AlC, Ti3AlC2, and TiC are discussed in relation to the number of Al layers per Ti layer in the two former systems and the corresponding change of the unusual materials properties.

  • 35.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Yang, L
    Guo, JH
    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.
    Agui, A
    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.
    Luo, Y
    Ågren, H
    Johansson, N
    Salaneck, WR
    Horsburgh, LE
    Monkman, AP
    The electronic structure of poly(pyridine-2,5-diyl) investigated by soft X-ray absorption and emission spectroscopies1998In: Chemical Physics, ISSN 0301-0104, E-ISSN 1873-4421, Vol. 237, no 3, 295-304 p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure of the poly-pyridine conjugated polymer has been investigated by resonant and non-resonant inelastic X-ray scattering and X-ray absorption spectroscopies using synchrotron radiation. The measurements were made for both the carbon and nitrogen contents of the polymer. The analysis of the spectra has been carried out in comparison with molecular orbital calculations taking the repeat-unit cell as a model molecule of the polymer chain. The simulations indicate no significant differences in the absorption and in the non-resonant X-ray scattering spectra for the different isomeric geometries, while some isomeric dependence of the resonant spectra is predicted. The resonant emission spectra show depletion of the π electron bands in line with symmetry selection and momentum conservation rules. The effect is most visual for the carbon spectra; the nitrogen spectra are dominated by lone pair n orbital emission of σ symmetry and are less frequency dependent.

  • 36.
    Magnuson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Yang, L
    Guo, JH
    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.
    Agui, A
    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.
    Luo, Y
    Ågren, Hans
    Johansson, N
    Salaneck, WR
    Horsburgh, LE
    Monkman, AP
    Resonant inelastic soft X-ray scattering spectra at the nitrogen and carbon K-edges of poly(pyridine-2,5-diyl)1999In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526, Vol. 101-103, 573-578 p.Article in journal (Refereed)
    Abstract [en]

    Resonant inelastic scattering measurements of the conjugated polymer, poly(pyridine-2,5-diyl) have been performed at the nitrogen and carbon K-edges using synchrotron radiation. For comparison, molecular orbital calculations of the spectra have been carried out with the repeat unit as a model molecule of the polymer chain. The resonant emission spectra show depletion of the π electron bands which is consistent with symmetry selection and momentum conservation rules. The depletion is most obvious in the resonant inelastic scattering spectra of carbon while the nitrogen spectra are dominated by lone pair n orbital emission of σ symmetry and are less excitation energy dependent. By comparing the measurements to calculations an isomeric dependence of the resonant spectra is found giving preference to two of the four possible isomers in the polymer.

  • 37.
    Martensson, N
    et al.
    Uppsala University.
    Weinelt, M
    Karis, O
    Uppsala University.
    Magnuson, Martin
    Uppsala University.
    Wassdahl, N
    Nilsson, A
    Stohr, J
    Samant, M
    Coherent and incoherent processes in resonant photoemission1997In: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, ISSN 0947-8396, Vol. 65, no 2, 159-167 p.Article in journal (Other scientific)
    Abstract [en]

    The basis for resonant photoemission is discussed in connection with data for a physisorption system, Ar/Pt(111) and a 3d transition metal, Ni(100). For Ar/Pt(111) the quasi-localized character of the intermediate state leads to two types of features in t

  • 38. Mattesini, Maurizio
    et al.
    Magnuson, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Tasnadi, Ferenc
    Höglund, Carina
    Abrikosov, Igor
    Hultman, Lars
    Elastic properties and electrostructural correlations in ternary scandium-based cubic inverse perovskites: A first-principles study2009In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 79, 125122- p.Article in journal (Refereed)
    Abstract [en]

    We have performed ab initio calculations for the cubic inverse-perovskite Sc3EN E=Al,Ga, In systems tostudy their electronic band-structures and elastic properties. In this study, we used the accurate augmentedplane wave plus local orbital method to find the equilibrium structural parameters and to compute the fullelastic tensors. The obtained single-crystal elastic constants were used to quantify the stiffness of the Sc-basedternary nitrides and to appraise their mechanical stability. The site-projected density of states, Fermi surfaces,and the charge-density plots have also been used to analyze the chemical bonding between the Sc6N cluster andthe surrounding metallic lattice of either Al, Ga, or In atoms. Our calculations show that Sc3GaN has the largestcovalent Sc-N bonding-type character with the highest Young, shear, and bulk moduli. Compared with theother two isoelectronic systems, it also behaves as the most brittle material with a relatively large elasticanisotropy.

  • 39. Men, Arturo
    et al.
    Rybka, M.
    Järrendahl, Kenneth
    Arwin, H.
    Magnuson, Martin
    Department of Physics, Chemistry and Biology, Linköping University.
    Hultman, L.
    Barsoum, M. W.
    Spectroscopic ellipsometry study on the dielectric function of bulk Ti2AlN,Ti2AlC, Nb2AlC, (Ti0.5,Nb0.5)2AlC, and Ti3GeC2 MAX-phases2011In: Journal of Applied Physics, Vol. 109, 013530- p.Article in journal (Refereed)
    Abstract [en]

    The averaged complex dielectric function epsilon=() /3 of polycrystalline Ti2AlN, Ti2AlC,Nb2AlC, (Ti0.5,Nb0.5)2AlC, and Ti3GeC2 was determined by spectroscopic ellipsometry coveringthe mid infrared to the ultraviolet spectral range. The dielectric functions of epsilon correspond to the perpendicular and parallel dielectric tensor components relative to the crystallographic c-axis ofthese hexagonal compounds. The optical response is represented by a dispersion model with Drude–Lorentz and critical point contributions. In the low energy range the electrical resistivity is obtainedfrom the Drude term and ranges from 0.48 microOhm m for Ti3GeC2 to 1.59 mucro Ohm m for (Ti0.5,Nb0.5)2AlC.Furthermore, several compositional dependent interband electronic transitions can be identified. Forthe most important ones, Im(epsilon) shows maxima at: 0.78, 1.23, 2.04, 2.48, and 3.78 eV for Ti2AlN;0.38, 1.8, 2.6, and 3.64 eV for Ti2AlC; 0.3, 0.92, and 2.8 eV in Nb2AlC; 0.45, 0.98, and 2.58 eV in(Ti0.5,Nb0.5)2AlC; and 0.8, 1.85, 2.25, and 3.02 eV in Ti3GeC2.

  • 40. Nilsson, PO
    et al.
    Kanski, J
    Thordson, JV
    Andersson, TG
    Nordgen, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    GUO, Jinghua
    Magnuson, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    ELECTRONIC-STRUCTURE OF BURIED SI LAYERS IN GAAS(001) AS STUDIED BY SOFT-X-RAY EMISSION1995In: Physical Review B-CONDENSED MATTER, Vol. 52, R8643- p.Article in journal (Refereed)
    Abstract [en]

    It is demonstrated that it is possible to investigate details of the electronic structure of an internal atomic monolayer using soft-x-ray-emission spectroscopy. The local and partial density of states of one monolayer and three monolayers of Si, embedded

  • 41. Takata, Y
    et al.
    Hatsui, T
    Kosugi, N
    Agui, A
    Magnuson, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Sathe, C
    Rubensson, JE
    Nordgren, J
    Valence excitations observed in resonant soft X-ray emission spectra of K2Ni(CN)(4)center dot H2O at the Ni 2p edge2001In: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, ISSN 0368-2048, Vol. 114, 909-913 Language: English p.Article in journal (Refereed)
    Abstract [en]

    Resonant soft X-ray emission spectra have been measured at the Ni 2p edge of a planar nickel complex K2Ni(CN)(4).H2O and interpreted by performing ah initio configuration interaction calculations. This cyano complex shows characteristic metal-to-ligand ch

  • 42. Weinelt, M
    et al.
    Nilsson, A
    Karis, O
    Uppsala University.
    Magnuson, Martin
    Uppsala University.
    Wiell, T
    Wassdahl, N
    Mårtensson, N
    Uppsala University.
    Resonant photoemission and resonant inelastic X-ray scattering - coherent vs. incoherent processes1996In: Ram an emission by X-ray scattering; Eds. D. L. Ederer and J. H. McGuire, World ScientificArticle in journal (Other (popular scientific, debate etc.))
  • 43. Weinelt, M
    et al.
    Nilsson, A
    Magnuson, Martin
    Uppsala University.
    Wiell, T
    Wassdahl, N
    Karis, O
    Uppsala University.
    Fohlisch, A
    Martensson, N
    Uppsala University.
    Stohr, J
    Samant, M
    Resonant photoemission at the 2p edges of Ni: Resonant Raman and interference effects1997In: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 78, no 5, 967-970 p.Article in journal (Other scientific)
    Abstract [en]

    Unambiguous evidence for resonant photoemission in Ni is presented. Interference effects are identified at the 2p edges for the valence band and the 6 eV satellite. A rapid transition from a resonant Raman to an Auger-like regime shows that the core-excit

  • 44. Yablonskikh, M V
    et al.
    Yarmoshenko, Y M
    Solovyev, I V
    Kurmaev, E Z
    Duda, Laurent
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Schmitt, Thorsten
    Magnuson, Martin
    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.
    Moewes, A
    Resonant L-alpha,L-beta X-ray emission and L-3,L-2 X-ray absorption spectra of 3d metals in Co(2)MnZ (Z = Al, Ga, Sn, Sb) Heusler alloys as an element- selective probe of spin character of valence band2005In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 144, 765-769 p.Article in journal (Refereed)
  • 45. Yablonskikh, M. V.
    et al.
    Yarmoshenko, Yu. M
    Solovyev, I. V.
    Kurmaev, E. Z.
    Duda, L.-C.
    Schmitt, T
    Magnuson, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Nordgren, Joseph
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Moewes, A
    Resonant L_a,B x-ray emission and L2,3 x-ray absorption spectra of 3d metals in Co2MnZ (Z=Al,Ga,Sn,Sb) Heusler alloys as an element specific probe of spin character of the valence band2005In: Journal of electron spectroscopy and related phenomena, Vol. 144-147, 765- p.Article in journal (Refereed)
  • 46.
    Yablonskikh, MV
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Grebennikov, VI
    Yarmoshenko, YM
    Kurmaev, EZ
    Butorin, SM
    Duda, LC
    Sathe, C
    Kaambre, T
    Magnuson, Martin
    Nordgren, J
    Plogmann, S
    Neumann, M
    Magnetic circular dichroism in X-ray fluorescence of Heusler alloys at threshold excitation2001In: SOLID STATE COMMUNICATIONS, ISSN 0038-1098, Vol. 117, no 2, 79-82 p.Article in journal (Refereed)
    Abstract [en]

    The results of fluorescence measurements of magnetic circular dichroism (MCD) in Mn L-2,L-3 X-ray emission and absorption for Heusler alloys NiMnSb and Co2MnSb are presented. Very intense resonance Mn L-3 emission is found at the Mn 2P(3/2) threshold and

1 - 46 of 46
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