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Sökning: WFRF:(Wassdahl N)

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1.
  • Karis, O., et al. (författare)
  • Observation of short- and long-range hybridization of a buried Cu monolayer in Ni
  • 2000
  • Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 62:24, s. R16239-R16242
  • Tidskriftsartikel (refereegranskat)abstract
    • 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 changes in the chemical interaction for these ultrathin film systems. In comparison to bulk Cu, the occupied d states of a buried Cu monolayer, as mapped in the x-ray emission spectrum, remain mostly unaltered. The absorption spectrum on the other hand shows that the empty states of the buried Cu monolayer are modified, and instead resemble the unoccupied electronic density of bulk Ni. These findings agree well with our first principle electronic structure calculations and the results are interpreted in terms of short- and long-range hybridization.
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2.
  • Karis, O, et al. (författare)
  • Probing surface states of Cu/Ni thin films using x-ray absorption spectroscopy
  • 2001
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 63:11
  • Tidskriftsartikel (refereegranskat)abstract
    • 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 state is identified in an x-ray absorption spectra and studied as a function of film thickness. Experimental data is supported by calculations of the layer-resolved density of states and the results from this combined theoretical-experimental effort show that the surface state is almost entirely located on the atomic layer closest to the vacuum. Our results also indicate strong hybridization between unoccupied states at the Cu/Ni interface boundary.
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4.
  • Wassdahl, N., et al. (författare)
  • Soft x-ray emission studies of adsorbates
  • 1992
  • Ingår i: Physical Review Letters. - 0031-9007. ; 69:5, s. 812-815
  • Tidskriftsartikel (refereegranskat)abstract
    • Soft x-ray emission spectroscopy is for the first time applied to surfaces and adsorbates. Surface sensitivity is achieved by employing synchrotron radiation in grazing incidence for the excitation. We present O K emission from adsorbed atomic oxygen on Ni(100) and Cu(100) and molecular CO on Ni(100). The observed spectral features correspond to the occupied 2p partial density of states of the adsorbates.
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5.
  • Denecke, R., et al. (författare)
  • Beamline 1511 at MAX II, capabilities and performance
  • 1999
  • Ingår i: Journal of Electron Spectroscopy and Related Phenomena. - 0368-2048. ; 101-103, s. 971-977
  • Tidskriftsartikel (refereegranskat)abstract
    • The new undulator beamline 1511 at MAX-lab, now under commissioning, has been optimized for X-ray emission and photoelectron spectroscopies. Using an SX-700 high flux monochromator the accessible photon energy range is from 90 eV to about 1500 eV. The performance of the undulator agrees very well with the specifications, as shown by measurements using a photodiode. The energy resolution of the monochromator has been checked using absorption measurements in a gas cell. It was found to meet the expectations and exceeds a resolving power of 10 000 at 244 eV. The photon flux as a function of energy has been recorded as well and gives a maximum flux of 3×1013 photons/s/100 mA/0.1% BW. Beamlines 1511 and 1411 will be the first synchrotron beamlines making use of a so-called beam waist phenomenon, known from laser physics. We show results of ray-tracing calculations to determine the ultimate spot size on the sample location. The endstations to be used at this new beamline and their capabilities will be discussed as an example of the future use of this facility.
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6.
  • Denecke, R, et al. (författare)
  • Beamline I511 at MAX II, capabilities and performance
  • 1999
  • Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 103, s. 971-977
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The new undulator beamline I511 at MAX-lab, now under commissioning, has been optimized for X-ray emission and photoelectron spectroscopies. Using an SX-700 high flux monochromator the accessible photon energy range is from 90 eV to about 1500 eV. The per
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7.
  • Fohlisch, A, et al. (författare)
  • Beyond the chemical shift: Vibrationally resolved core-level photoelectron spectra of adsorbed CO
  • 1998
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 81:8, s. 1730-1733
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Vibrational fine structure has been observed in the Cls and O1s photoelectron lines of CO adsorbed on Ni(100). This allows a detailed separation of vibrational and electronic contributions to the line profile. The main line is found to represent the fully
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8.
  • Karis, O, et al. (författare)
  • Observation of short- and long-range hybridization of a buried Cu monolayer in Ni
  • 2000
  • Ingår i: PHYSICAL REVIEW B. - 0163-1829. ; 62:24, s. R16239-R16242
  • Tidskriftsartikel (refereegranskat)abstract
    • 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
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9.
  • Karis, O, et al. (författare)
  • One-step and two-step description of deexcitation processes in weakly interacting systems
  • 1996
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMER INST PHYSICS. ; 76:8, s. 1380-1383
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The origin of one- and two-step behavior of core-hole decay processes is identified in connection with high resolution autoionization spectra for Ar/Pt(111). The spectra simultaneously show features of the two types (resonant Raman vs Auger-like behavior)
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10.
  • Magnuson, Martin, 1965-, et al. (författare)
  • Coherent and Incoherent Processes in resonant Photoemission
  • 1997
  • Ingår i: Advanced Light Source. - California, USA : Ernest Orlando Lawrence Berkeley National Laboratory, University of California Berkeley. ; 65:2, s. 159-167
  • Bokkapitel (populärvet., debatt m.m.)
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11.
  • Magnuson, Martin, et al. (författare)
  • X-ray fluorescence spectra of metals excited below threshold
  • 2003
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 68:4
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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12.
  • Martensson, N, et al. (författare)
  • Coherent and incoherent processes in resonant photoemission
  • 1997
  • Ingår i: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING. - 0947-8396. ; 65:2, s. 159-167
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • 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
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13.
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15.
  • Rubensson, J. E., et al. (författare)
  • Resonant behavior in soft x-ray fluorescence excited by monochromatized synchrotron radiation
  • 1988
  • Ingår i: Physical Review Letters. - 0031-9007. ; 60:17, s. 1759-1762
  • Tidskriftsartikel (refereegranskat)abstract
    • Soft x-ray emission spectra of TiN, excited by monochromatized synchrotron radiation, have been recorded in a grazing-incidence spectrometer. The tunability of the excitation energy has allowed the pure N K and Ti LIII emission spectra to be isolated for the first time. A new type of resonance is observed in the Ti L emission spectrum, and interpreted as due to the decay of a quasiatomic intermediate state. The results call for a reinterpretation of Ti L spectra and a revision of the interpretation of 3d-metal L-emission spectra in general.
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17.
  • Wassdahl, N., et al. (författare)
  • Synchrotron-radiation-excited soft-x-ray-fluorescence studies of Cu and Zn : On the validity of the sudden approximation
  • 1990
  • Ingår i: Physical Review Letters. - 0031-9007. ; 64:23, s. 2807-2810
  • Tidskriftsartikel (refereegranskat)abstract
    • The L23 x-ray-emission spectra of Cu and Zn have been recorded using tunable-synchrotron-radiation-excited fluorescence spectroscopy. The satellite structure was studied in detail by varying the excitation energy from threshold to several hundred eV above. Strong satellites are observed which can unambiguously be associated with the decay of multiply excited states. This disproves recent claims of a breakdown of the sudden approximation in this regime.
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18.
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19.
  • Weinelt, M., et al. (författare)
  • Resonant Photoemission at the 2p Edges of Ni: Resonant Raman and Interference Effects
  • 1997
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 78:5, s. 967-970
  • Tidskriftsartikel (refereegranskat)abstract
    • 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-excited states above threshold are not localized enough to significantly enhance the photoemission intensity, implying a large fraction of incoherent intensity. The results indicate that the appearance of interference effects does not require strong localization of the intermediate state.
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20.
  • Weinelt, M, et al. (författare)
  • Resonant photoemission at the 2p edges of Ni: Resonant Raman and interference effects
  • 1997
  • Ingår i: PHYSICAL REVIEW LETTERS. - 0031-9007. ; 78:5, s. 967-970
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • 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
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21.
  • AGREN, H, et al. (författare)
  • SYMMETRY SELECTIVE RESONANT INELASTIC X-RAY-SCATTERING
  • 1995
  • Ingår i: PHYSICA B. - : ELSEVIER SCIENCE BV. - 0921-4526. ; 209:1-4, s. 105-107
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We use two species with high point group symmetry, fullerene and benzene, to discuss important features of symmetry selective resonant inelastic X-ray scattering spectroscopy.
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25.
  • Butorin, S.M, et al. (författare)
  • Tunable excitation x-ray-fluorescence spectroscopy in phase-analysis of high-Tc superconductors
  • 1994
  • Ingår i: Journal of physics-condensed matter. - 0953-8984. ; 6:43, s. 9267-9274
  • Tidskriftsartikel (refereegranskat)abstract
    • O Kalpha x-ray fluorescence of YBa2Cu3O7-delta and Sr0.85Nd0.15CuO2 samples containing CO3(2-) impurities, as well as pure BaCO3, have been studied using tunable monochromatic synchrotron radiation excitation. When the excitation energy is set to the most intense features in the O 1s absorption edge of cuprates and to bound states above this edge the O Kalpha spectra recorded are very similar to those of pure BaCO3 even if the admixture of CO3(2-) is small. The observed changes in the O Kalpha profiles of multi-phase YBa2Cu3O7-delta and Sr0.85Nd0.15CuO2 samples are discussed in terms of different x-ray absorption cross sections for O in the main phase and in the CO3(2-) fraction.
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27.
  • BUTORIN, SM, et al. (författare)
  • ON THE HYBRIDIZATION OF CE 4F STATES IN CEF3 AND CEO2 - A NEARTHRESHOLD EXCITATION X-RAY-FLUORESCENCE STUDY
  • 1995
  • Ingår i: JOURNAL OF ALLOYS AND COMPOUNDS. - : ELSEVIER SCIENCE SA LAUSANNE. - 0925-8388. ; 225:1-2, s. 230-233
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The Ce M(4,5) X-ray absorption and resonant Ce M alpha,beta (M(4,5) --> N-6,N-7) X-ray emission was measured for CeF3 and CeO2 using monochromatic synchrotron radiation. For CeF3, the recombination peak is dominant in the emission spectra recorded at diff
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28.
  • Butorin, SM, et al. (författare)
  • Resonant valence-to-core x-ray fluorescence spectroscopy on PrO2
  • 1997
  • Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 9:38, s. 8155-8160
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The results of 4f --> 3d x-ray fluorescence measurements, performed with monochromatic-photon excitation at Pr M-4,M-5 absorption edges of PrO2, are presented and discussed in the framework of an Anderson impurity model. The dependence of the fluorescence
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29.
  • Butorin, SM, et al. (författare)
  • Resonant X-ray fluorescence spectroscopy of correlated systems: A probe of charge-transfer excitations
  • 1996
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMER INST PHYSICS. - 0031-9007. ; 77:3, s. 574-577
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • X-ray fluorescence spectroscopy with monochromatic photon excitation is presented as a tool for studies of charge-transfer excitations in correlated systems, using CeO2 and UO3 as examples. Ce 4f --> 3d and U 5f --> 3d x-ray fluorescence, with excitation
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35.
  • Duda, LC, et al. (författare)
  • Symmetry selection in polarized resonant X-ray emission spectroscopy in La2CuO4
  • 1998
  • Ingår i: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN. - : PHYSICAL SOCIETY JAPAN. ; 67:2
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Experimental and theoretical investigations are made for the polarization dependence in the resonant X-ray emission spectra due to the Cu 3d --> 2p electronic transition under the Cu 2p --> 3d resonant excitation (Cu 2p-RXES) in La2CuO4. It is shown that
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36.
  • FINKELSTEIN, LD, et al. (författare)
  • REDISTRIBUTION OF O2P-STATES IN LA2CUO4 BY SR-DOPING
  • 1995
  • Ingår i: SOLID STATE COMMUNICATIONS. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0038-1098. ; 95:8, s. 503-506
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The difference between the oxygen K-alpha X-ray emission spectra of in-plane oxygen in La2-xSrxCuO4 (x=0.07; 0.15), measured with selective fluorescence excitation, is compared with the difference of the corresponding oxygen 1s X-ray absorption spectra. I
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37.
  • Fohlisch, A, et al. (författare)
  • Ground-state interpretation of x-ray emission spectroscopy on adsorbates: CO adsorbed on Cu(100)
  • 2000
  • Ingår i: PHYSICAL REVIEW B. - : AMERICAN PHYSICAL SOC. - 0163-1829. ; 61:23, s. 16229-16240
  • Tidskriftsartikel (refereegranskat)abstract
    • The application of resonant inelastic x-ray scattering and resonantly excited x-ray emission to adsorbates has evolved into a powerful technique to investigate the valence electronic structure of adsorbates in an atom-specific and orbital-symmetry-selecti
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38.
  • Glans, Peter, et al. (författare)
  • Determination of the lifetime width of the argon L1-hole state
  • 1993
  • Ingår i: Physical Review A (Atomic, Molecular, and Optical Physics). - 1050-2947. ; 47:2, s. 1539-1542
  • Tidskriftsartikel (refereegranskat)abstract
    • The width of the argon 2s level was experimentally obtained from x-ray emission-spectroscopy (2.25+/-0.15 eV) and x-ray photoelectron-spectroscopy (XPS) (2.25+/-0.05 eV) measurements. A theoretical value of 1.85 eV was obtained by a Green's-function calculation. A high-energy satellite located 2.7+/-0.2 eV above the L1-M2,3 x-ray emission transition was confirmed and identified as the 2s(-1)3p-1-->3p-2 double-hole transition. The XPS measurement of the argon 2s ionization energy gave a value of 326.25(5) eV.
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39.
  • Glans, Peter, et al. (författare)
  • Resonant x-ray emission spectroscopy of molecular oxygen
  • 1996
  • Ingår i: Physical Review Letters. - : AMER INST PHYSICS. - 0031-9007. ; 76:14, s. 2448-2451
  • Tidskriftsartikel (refereegranskat)abstract
    • Resonant soft x-ray emission spectroscopy has been applied to study the issue of symmetry breaking upon core-hole excitation in molecular oxygen. The results provide direct evidence that the inversion symmetry is not broken in the core-excited states. Furthermore, the experiments themselves demonstrate a new experimental technique of broad applicability for studies of electronic structure and excitation dynamics in free atoms and molecules.
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42.
  • Guo, J.H., et al. (författare)
  • Resonant excitation x-ray-fluorescence from C-60
  • 1995
  • Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 52, s. 10681-
  • Tidskriftsartikel (refereegranskat)abstract
    • X-ray fluorescence of condensed C-60 has been recorded in high resolution using monochromatic synchrotron radiation excitation. Strong intensity modulation of constituent spectral features is observed with varying excitation energy up to 10 eV above threshold. The energy dependence is interpreted as due to resonant inelastic x-ray scattering, leading to symmetry selection rules governing the two-photon process in the fully symmetric molecule.
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43.
  • Guo, JH, et al. (författare)
  • In situ and ex situ characterization of thin films by soft X-ray emission spectroscopy
  • 2000
  • Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 110:1-3, s. 41-67
  • Tidskriftsartikel (refereegranskat)abstract
    • Soft X-ray emission spectroscopy has been used as a chemical probe in the characterization of thin film materials. Some examples of soft X-ray emission studies are presented to show the chemical sensitivity, site selectivity and depth dependence of this m
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44.
  • GUO, JH, et al. (författare)
  • RESONANT AND NONRESONANT X-RAY-SCATTERING FROM C-70
  • 1995
  • Ingår i: CHEMICAL PHYSICS LETTERS. - : ELSEVIER SCIENCE BV. - 0009-2614. ; 235:1-2, s. 152-159
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Resonant and non-resonant X-ray scattering spectra of the C-70 molecule are presented and analyzed by ab initio Hartree-Fock calculations using a newly developed formalism for symmetry selective inelastic X-ray scattering. Compared to C-60, a weak excitat
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45.
  • GUO, JH, et al. (författare)
  • RESONANT EXCITATION X-RAY-FLUORESCENCE FROM C-60
  • 1995
  • Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. ; 52:15
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • X-ray fluorescence of condensed C-60 has been recorded in high resolution using monochromatic synchrotron radiation excitation. Strong intensity modulation of constituent spectral features is observed with varying excitation energy up to 10 eV above thres
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46.
  • Guo, JH, et al. (författare)
  • The electronic structure of K6C60 studied by soft X-ray spectroscopy
  • 2001
  • Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 114, s. 885-888
  • Tidskriftsartikel (refereegranskat)abstract
    • The electronic structure of C-60 and potassium doped C-60 has been studied by soft-X-ray absorption and emission spectroscopies. The C K alpha emission spectrum of doped C-60 shows a resolved filled lowest unoccupied molecular orbitals (LUMO) (t(1 alpha))
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47.
  • Hasselstrom, J, et al. (författare)
  • Ammonia adsorbed on Cu(110): An angle resolved x-ray spectroscopic and ab initio study
  • 1999
  • Ingår i: JOURNAL OF CHEMICAL PHYSICS. - : AMER INST PHYSICS. - 0021-9606. ; 110:10, s. 4880-4890
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We present a study of a monolayer of ammonia (NH3) adsorbed on Cu(110) using core level spectroscopies in combination with ab initio calculations based on density functional theory. In particular, x-ray emission spectroscopy has been applied, providing an
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48.
  • Hasselstrom, J, et al. (författare)
  • The adsorption structure of glycine adsorbed on Cu(110); comparison with formate and acetate/Cu(110)
  • 1998
  • Ingår i: SURFACE SCIENCE. - : ELSEVIER SCIENCE BV. - 0039-6028. ; 407:1-3, s. 221-236
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The molecular orientation of an ordered monolayer of glycine adsorbed on Cu(110) has been studied using X-ray Photoelectron Spectroscopy (XPS), Near Edge X-ray Absorption Fine Structure (NEXAFS), X-ray Photoelectron Diffraction (XPD), Low-Energy Electron
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49.
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50.
  • Johansson, E, et al. (författare)
  • Carbon growth in diamond deposition on nickel studied in situ by soft x-ray emission spectroscopy
  • 1996
  • Ingår i: JOURNAL OF APPLIED PHYSICS. - : AMER INST PHYSICS. ; 79:9, s. 7248-7255
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The initial stages of diamond growth on nickel have been studied by in situ electron-excited soft x-ray emission spectroscopy. The study has been able to clarify that the codeposition of ordered graphite at the substrate/film interface is due to carbon pr
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