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Sökning: WFRF:(Nordgren H) > (1995-1999)

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1.
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3.
  • 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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4.
  • Gunnelin, K, et al. (författare)
  • Assigning x-ray absorption spectra by means of soft-x-ray emission spectroscopy
  • 1998
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947. ; 57:2, s. 864-872
  • Tidskriftsartikel (refereegranskat)abstract
    • The possibility to symmetry assign x-ray absorption spectra using x-ray emission spectroscopy is demonstrated. The oxygen K spectra of CO2 are used to illustrate the possibility to assign core excitations through excitation-energy and angular dependence of resonantly excited x-ray emission spectra. The Rydberg-associated structures just below the ionization threshold in the O K x-ray absorption spectrum are assigned to be mainly due to excitations to orbitals of sigma(g) character. The results, which contradict some previous literature assignments, are supported by quantum-chemical calculations.
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5.
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6.
  • Guo, J.-H., et al. (författare)
  • How the phenyle rings (benzene) act as building blocks in pi conjugated polymers
  • 1998
  • Ingår i: Advanced Light Source. - Berkeley : Ernest Orlando Lawrence Berkeley National Laboratory, University of California Berkeley, California, USA. ; , s. 129-132
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • Organic conjugated polymers have the electronic structure of semiconductors and can be doped to become good conductors (1). Conjugated polymers are now used as active materials in a wide variety of prototype applications such as light emitting diodes [2] and organic transistors [3,4]. Most of the interesting chemistry and physics of conjugated polymers is associated with the details of the electronic structure at the valence and conduction band edges and, in this connection, various electron spectroscopies can be used as tools for diagnosis of the relevant electronic and geometric properties....
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7.
  • Guo, J.-H., et al. (författare)
  • Resonant and nonresonant x-ray scattering spectra of some poly(phenylenevinylene)s
  • 1998
  • Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 108:14, s. 5990-5996
  • Tidskriftsartikel (refereegranskat)abstract
    • 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, indicating a local character of the x-ray emission in which the phenyl ring acts as a building block. Theoretical simulations of x-ray energies and intensities taking the repeat unit as a model molecule of the polymer agree with the experimental spectra fairly well. The edges of the occupied bands have been identified in the nonresonant spectra of each polymer. By subtracting the emission energy of the highest occupied molecular orbital in the nonresonant spectrum from the core excitation energy in the resonant spectrum an alternative way to determine the optical band gap is obtained. As for free benzene the outer π band in the polymer spectra show a depletion of the emission going from the nonresonant to the resonant x-ray emission spectra. It is demonstrated that this transition, which is strictly symmetry forbidden for free benzene, becomes effectively forbidden in the polymer case as a result of strong interference effects, and it is argued that this is the general case for resonant x-ray emission of conjugated polymers as far as the frozen orbital approximation holds.
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8.
  • 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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9.
  • Magnuson, Martin, 1965-, et al. (författare)
  • Resonant inelastic soft X-ray scattering spectra at the nitrogen and carbon K-edges of poly(pyridine-2,5-diyl)
  • 1999
  • Ingår i: Journal of Electron Spectroscopy and Related Phenomena. - 0368-2048 .- 1873-2526. ; 101-103, s. 573-578
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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10.
  • Magnuson, Martin, 1965-, et al. (författare)
  • The electronic structure of poly(pyridine-2,5-diyl) investigated by soft X-ray absorption and emission spectroscopies
  • 1998
  • Ingår i: Chemical Physics. - 0301-0104 .- 1873-4421. ; 237:3, s. 295-304
  • Tidskriftsartikel (refereegranskat)abstract
    • 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 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 symmetry and are less frequency dependent.
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11.
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13.
  • Skytt, P, et al. (författare)
  • Quenching of symmetry breaking in resonant inelastic X-ray scattering by detuned excitation
  • 1996
  • Ingår i: Physical Review Letters. - 0031-9007. ; 77:25, s. 5035-5038
  • Tidskriftsartikel (refereegranskat)abstract
    • Observations made in oxygen K emission of CO2 show that the symmetry selective character of resonant x-ray emission is excitation energy dependent. Electronically dipole forbidden O K emission lines are observed for excitation at the O 1s --> pi* resonance, and they are gradually reduced upon detuning the excitation energy below threshold. The occurrence of forbidden transitions is explained in terms of dynamical symmetry breaking due to vibronic coupling, and the observation of quenching of the symmetry breaking upon detuning as due to an effective quenching of this vibronic coupling. Scattering theory applied to a few-level system is shown to account for the energy dependence of the symmetry selection in the limit of narrow bandpass photon excitation.
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14.
  • Skytt, P, et al. (författare)
  • Role of screening and angular distributions in resonant x-ray emission of CO
  • 1997
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947. ; 55:1, s. 134-145
  • Tidskriftsartikel (refereegranskat)abstract
    • Resonantly excited carbon and oxygen x-ray-emission spectra of gaseous carbon monoxide are presented. Emission spectra obtained with selective excitation to the pi* valence orbital and to various Rydberg levels are compared to satellite-free nonresonant spectra. Screening effects caused by the excited electron, creating energy shifts and intensity variations in the resonant spectra compared to the nonresonant spectra, are observed, as well as an angular dependence of the resonantly excited spectra. The experimental spectra are compared to simulated spectra where the vibronic part is computed by means of a lifetime-vibrational interference formalism. The electronic intensities are analyzed by a separate-state, self-consistent-held method and a formalism for resonant inelastic x-ray scattering, focusing On screening and angular dependence.
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15.
  • 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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16.
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17.
  • Bliman, S, et al. (författare)
  • Collision spectroscopy of Ar8++H-2 at low velocities (upsilon < 1 a.u.)
  • 1999
  • Ingår i: PHYSICAL REVIEW A. - : AMERICAN PHYSICAL SOC. - 1050-2947. ; 60:4, s. 2799-2807
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Single and double electron transfer have been studied for the collision system Ar8++H-2 at low velocities (V<1 a.u.). X-ray ultraviolet and Auger spectroscopies complemented by translational energy gain and time-of-flight spectroscopies reveal details on
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18.
  • Brodin, H, et al. (författare)
  • Rehabilitation in Schweden.
  • 1999
  • Ingår i: Phys Rehab Kur Med. ; 9, s. 25-
  • Tidskriftsartikel (refereegranskat)
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19.
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20.
  • Butorin, S. M., et al. (författare)
  • Low-energy d-d excitations in MnO studied by resonant x-ray fluorescence spectroscopy
  • 1996
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 54, s. 4405-4408
  • Tidskriftsartikel (refereegranskat)abstract
    • We measured the Mn Lα,β x-ray fluorescence spectra of MnO excited by selected photon energies near the L2,3 absorption edges. The resulting resonant inelastic x-ray scattering spectra probe low-lying electronic excited states, due to dd and charge-transfer excitations. Using a two-step model and a purely atomic approximation, we reproduce both energies and varying intensities of dd excitations relative to the electronic recombination peak. Our results show that strongly varying line shapes in resonant x-ray emission need not be due to channel interference effects.
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21.
  • Butorin, S. M., et al. (författare)
  • Resonant inelastic soft X-ray scattering at the 4d edge of Ce-based heavy fermion materials
  • 1999
  • Ingår i: Journal of Electron Spectroscopy and Related Phenomena. - 0368-2048 .- 1873-2526. ; 101-103, s. 783-786
  • Tidskriftsartikel (refereegranskat)abstract
    • Resonant X-ray scattering measurements were performed on CeB6, CeAl, γ-Ce, and α-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 the elastic peak. The structure shows a distinct resonant behavior as well as a dependence on the degree of 4f hybridization and can therefore be attributed to charge-transfer excitations to the 4f0 state. The intensity of the elastic peak increases when going from the systems with low Kondo temperature TK to those with high TK which is consistent with a Kondo scale behavior. By analyzing the scattering data, a controversial issue on the validity of a single-impurity Anderson model in heavy-fermion materials is addressed.
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22.
  • Butorin, S. M., et al. (författare)
  • Resonant inelastic soft-x-ray scattering from valence-band excitations in 3d0 compounds
  • 1997
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 55, s. 4242-4249
  • Tidskriftsartikel (refereegranskat)abstract
    • Ti and Mn Lα,Β x-ray fluorescence spectra of FeTiO3 and KMnO4 were measured with monochromatic photon excitation on selected energies across the L2,3 absorption edges. The resulting inelastic x-ray-scattering structures and their changes with varying excitation energies are interpreted within the framework of a localized, many-body approach based on the Anderson impurity model, where the radiative process is characterized by transitions to low-energy interionic-charge-transfer excited states. Sweeping the excitation energy through the metal 2p threshold enhances the fluorescence transitions to the antibonding states pushed out of the band of continuous states due to strong metal 3d–ligand 2p hybridization and matching the low-photon-energy satellites in the spectra. Based on the energy position of these charge-transfer satellites with respect to the recombination peak the effective metal 3d–ligand 2p hybridization strength in the ground state of the system can be estimated directly from the experiment.
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23.
  • Cesar, A, et al. (författare)
  • Resonant x-ray scattering beyond the Born-Oppenheimer approximation: Symmetry breaking in the oxygen resonant x-ray emission spectrum of carbon dioxide
  • 1997
  • Ingår i: Journal of Chemical Physics. - 0021-9606. ; 106:9, s. 3439-3456
  • Tidskriftsartikel (refereegranskat)abstract
    • Although resonant x-ray scattering of molecules fulfills strict electronic symmetry selection rules, as now firmly proven by. spectra of diatomic molecules, the accumulated body of data for polyatomic molecules indicates that an apparent breaking of these rules represents the common situation rather than the exception. The CO2 molecule provides a good example of symmetry breaking, with the. oxygen x-ray emission spectra showing strong intensity for transitions that are forbidden by the parity selection rule. We present time-independent and time-dependent theories for frequency-dependent resonant x-ray scattering beyond, the Born-Oppenheimer approximation in order to explore under what circumstances one can anticipate symmetry breaking in the spectra of polyatomic molecules. The theory starts out from the Kramers-Heisenberg dispersion relation and is generalized for vibrational degrees of freedom and for nonadiabatic coupling of the electronic (vibronic) states, including the frequency dependency of, the scattering cross section. Different Limiting cases and few-level models are considered. The symmetry breaking is proven to be the result of pseudo-Jahn-Teller-Like vibronic coupling between near-degenerate core-excited states. Thus vibromic interaction over the antisymmetric vibrational mode between the ''bright'' 1 sigma(g)(-1)2 pi(u)(-1) and ''dark'' 1 sigma(u)(-1)2 pi(u)(-1) intermediate states of CO2 allows transitions otherwise forbidden. The measurements and theory demonstrate that the symmetry-selective character of the resonant x-ray emission is strongly frequency dependent. The strong intensity of ''dipole-forbidden'' transitions in the pi* oxygen K spectrum at resonance is reduced monotonically with the detuning of the excitation energy from resonance, and the spectra become ''symmetry purified.'' Simulations with full vibronic coupling predict this feature of the x-ray scattering experiment and a few-level model explains the energy dependence of the symmetry selection and the symmetry purification at large detuning energies in the limit of narrowband photon excitation.
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26.
  • Glans, Peter, et al. (författare)
  • Selectively excited x-ray emission spectra of N2
  • 1996
  • Ingår i: Journal of Electron Spectroscopy and Related Phenomena. - 0368-2048. ; 82:3, s. 193-201
  • Tidskriftsartikel (refereegranskat)abstract
    • Resonant and non-resonant X-ray emission spectra of N-2 are presented. The role of the parity selection rule in the case of homonuclear diatomic molecules is discussed thoroughly and illustrated by the X-ray emission spectra. We also discuss how the parity selection rule and the angular anisotropy of the resonant X-ray emission may affect intensities in a fluorescence yield measurement of N-2. Simulated vibrational band profiles calculated using the lifetime-vibrational interference formula are found to be in excellent agreement with the experimental emission bands.
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27.
  • Gunnelin, K, et al. (författare)
  • Assigning x-ray absorption spectra by means of soft-x-ray emission spectroscopy
  • 1998
  • Ingår i: PHYSICAL REVIEW A. - : AMERICAN PHYSICAL SOC. - 1050-2947. ; 57:2, s. 864-872
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The possibility to symmetry assign x-ray absorption spectra using x-ray emission spectroscopy is demonstrated. The oxygen K spectra of CO2 are used to illustrate the possibility to assign core excitations through excitation-energy and angular dependence o
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28.
  • Gunnelin, K, et al. (författare)
  • Bond-length-dependent core hole localization observed in simple hydrocarbons
  • 1999
  • Ingår i: Physical Review Letters. - 0031-9007. ; 83:7, s. 1315-1318
  • Tidskriftsartikel (refereegranskat)abstract
    • Soft x-ray-emission spectroscopy is applied to measure the amount of dynamic symmetry breaking in core-excited acetylene, ethylene, and ethane. Large variations are observed between the molecules and are rationalized in terms of the different C-C bond lengths: Shorter bond lengths give smaller symmetry breaking. The results also indicate that asymmetric modes are important for all the systems studied, in contradiction to previous assumptions in literature.
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29.
  • Gunnelin, K, et al. (författare)
  • Bond-length-dependent core hole localization observed in simple hydrocarbons
  • 1999
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 83:7, s. 1315-1318
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Soft x-ray-emission spectroscopy is applied to measure the amount of dynamic symmetry breaking in core-excited acetylene, ethylene, and ethane. Large variations are observed between the molecules and are rationalized in terms of the different C-C bond len
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30.
  • Guo, J. H., et al. (författare)
  • Characterization of undulator radiation at MAXII using a soft X-ray fluorescence spectrometer
  • 1999
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0168-9002. ; 431:1, s. 285-293
  • Tidskriftsartikel (refereegranskat)abstract
    • A grazing-incidence grating spectrometer has been used for the investigation of the undulator radiation from beamline 411 at MAX-lab. The direct detection of undulator light is expected to obtain the information of the quality of the undulator. Regular undulator radiation and some higher harmonics were observed. The effects of electronic beam coupling and Landau cavities have been studied. The experiment presents an easy and quick method to characterize the undulator radiation before the permanent monochromator is installed.
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31.
  • 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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32.
  • Guo, JH, et al. (författare)
  • Resonant and nonresonant x-ray scattering spectra of some poly(phenylenevinylene)s
  • 1998
  • Ingår i: JOURNAL OF CHEMICAL PHYSICS. - 0021-9606. ; 108:14, s. 5990-5996
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • 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
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33.
  • 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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41.
  • Magnuson, Martin, 1965-, et al. (författare)
  • The electronic structure of polyaniline and doped phases studied by soft X-ray absorption and emission spectroscopies
  • 1999
  • Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 111:10, s. 4756-4761
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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45.
  • Sjogren, S, et al. (författare)
  • Response on p53
  • 1996
  • Ingår i: J Natl Cancer Inst. ; 88, s. 1500-
  • Tidskriftsartikel (refereegranskat)
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46.
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47.
  • Skytt, P, et al. (författare)
  • Lifetime-vibrational interference effects in the resonantly excited x-ray-emission spectra of CO
  • 1997
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947. ; 55:1, s. 146-154
  • Tidskriftsartikel (refereegranskat)abstract
    • A systematic study of vibrational band profiles in resonantly excited x-ray-emission spectra of free molecules is made. Carbon and oxygen K-emission spectra of CO following core excitations, using narrow-bandpass synchrotron radiation, to the 2 pi orbital an presented. Because of the short lifetime of the core-excited states, interference effects between close-lying coherently excited vibrational levels may occur. The importance of lifetime-vibrational interference in the carbon and oxygen x-ray-emission spectra is investigated by comparing the experimental band profiles with simulated profiles. It is shown that to properly describe the band profiles in the oxygen emission spectra it is necessary to include the interference contributions, while in the carbon spectra the interference contributions are important only when the excitation energy is tuned towards higher vibrational levels. For example, when the excitation energy is tuned to the upsilon=2 vibrational level significant interference effects are observed. It is also demonstrated how emission spectra recorded with a detuning of the excitation energy from the resonance can be used to check the shape of the photon distribution of the synchrotron radiation.
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48.
  • SKYTT, P, et al. (författare)
  • PROBING SYMMETRY-BREAKING UPON CORE EXCITATION WITH RESONANT X-RAY-FLUORESCENCE
  • 1995
  • Ingår i: PHYSICAL REVIEW A. - : AMER INST PHYSICS. - 1050-2947. ; 52:5, s. 3572-3576
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Resonantly excited x-ray fluorescence spectra of the benzene molecule are presented and analyzed in terms of symmetry-selective resonant scattering processes. The sharp frequency dependency that is observed can be understood from strict parity and symmetr
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49.
  • Skytt, P, et al. (författare)
  • Quenching of symmetry breaking in resonant inelastic X-ray scattering by detuned excitation
  • 1996
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMER INST PHYSICS. - 0031-9007. ; 77:25, s. 5035-5038
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Observations made in oxygen K emission of CO2 show that the symmetry selective character of resonant x-ray emission is excitation energy dependent. Electronically dipole forbidden O K emission lines are observed for excitation at the O 1s --> pi* resonanc
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50.
  • Skytt, P, et al. (författare)
  • Role of screening and angular distributions in resonant x-ray emission of CO
  • 1997
  • Ingår i: PHYSICAL REVIEW A. - : AMER INST PHYSICS. - 1050-2947. ; 55:1, s. 134-145
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Resonantly excited carbon and oxygen x-ray-emission spectra of gaseous carbon monoxide are presented. Emission spectra obtained with selective excitation to the pi* valence orbital and to various Rydberg levels are compared to satellite-free nonresonant s
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