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Träfflista för sökning "WFRF:(James Paul A.) ;srt2:(2005-2009);pers:(Nordgren Joseph)"

Sökning: WFRF:(James Paul A.) > (2005-2009) > Nordgren Joseph

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1.
  • Kjeldgaard, Lisbeth, et al. (författare)
  • Intramolecular vibronic dynamics in molecular solids: C60
  • 2005
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 72:20
  • Tidskriftsartikel (refereegranskat)abstract
    • Vibronic coupling in solid C60 has been investigated with a combination of resonant photoemission spectroscopy (RPES) and resonant inelastic x-ray scattering (RIXS). Excitation as a function of energy within the lowest unoccupied molecular orbital resonance yielded strong oscillations in intensity and dispersion in RPES, and a strong inelastic component in RIXS. Reconciling these two observations establishes that vibronic coupling in this core hole excitation leads to predominantly inelastic scattering and localization of the excited vibrations on the molecule on a femtosecond time scale. The coupling extends throughout the widths of the frontier valence bands.
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2.
  • Käämbre, Tanel, et al. (författare)
  • Bulk electronic structure of K3C60 as revealed by soft x-rays
  • 2007
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 75:19, s. 195432-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present C 1s x- ray absorption, x- ray emission, and resonant inelastic x- ray scattering (RIXS ) spectra of single- phase crystalline K3C60. The comparison to valence- band photoelectron spectra from the same sample facilitates identification of the contribution from surface and bulk electronic states in the latter. Bulk- sensitive techniques show that the valence bands of K3C60 and pure C-60 are characterized by spectral features of similar width, in agreement with the predictions of band- structure calculations. Symmetry selectivity in the RIXS process allows us to assign peaks in the C 1s absorption spectrum, demonstrating a close correspondence with pure C-60 also in the conduction band. The symmetry selectivity is as pronounced in K3C60 as in pure C-60, indicating that the local C-60 symmetry is not appreciably affected by the K doping, either in the ground state or intermediate state, on the time scale of 6 fs.
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