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Effects of core-level degeneracies on core-level spectra

Almbladh, Carl-Olof LU and Birgersson, Martin LU (2004) In Journal of Electron Spectroscopy and Related Phenomena 137-40. p.393-399
Abstract
Effects of core-level degeneracies on X-ray photoemission spectra are considered theoretically and computationally. Processes within each degenerate sub-level manifold are treated by a leading-order cumulant approximation, and processes which connect spin-orbit or crystal-field split levels to leading order in the core-electron self-energy. The cumulant approximation is consistent with earlier asymptotic results and correctly describe the leading moments of the core-electron spectrum. The central quantity in both cases is an exponent function which may be expressed in terms of projected state densities and core-valence Coulomb matrix elements. Numerical results are presented for the Al L-2.3 and the Rh and Pd M-4.5 levels and compared with... (More)
Effects of core-level degeneracies on X-ray photoemission spectra are considered theoretically and computationally. Processes within each degenerate sub-level manifold are treated by a leading-order cumulant approximation, and processes which connect spin-orbit or crystal-field split levels to leading order in the core-electron self-energy. The cumulant approximation is consistent with earlier asymptotic results and correctly describe the leading moments of the core-electron spectrum. The central quantity in both cases is an exponent function which may be expressed in terms of projected state densities and core-valence Coulomb matrix elements. Numerical results are presented for the Al L-2.3 and the Rh and Pd M-4.5 levels and compared with recent experiments. In the case of Rh M-4.5, the level-dependent effects are strong leading to an increased asymmetry, a much increased lifetime width of the M-4 level, and deviation from Lorentzian lifetime broadening. In Pd, the effects are much weaker owing to a much smaller Fermi-surface d density of states at the core-hole atom, and it is almost negligible in Al, the most noticeable effect being an increased width of the lower L-2 component. (C) 2004 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
core-level spectra, many-body effects
in
Journal of Electron Spectroscopy and Related Phenomena
volume
137-40
pages
393 - 399
publisher
Elsevier
external identifiers
  • wos:000222251900060
  • scopus:2942534829
ISSN
0368-2048
DOI
10.1016/j.elspec.2004.02.117
language
English
LU publication?
yes
id
15f75610-c9b2-4ee7-b8d1-7713f592c71b (old id 273870)
date added to LUP
2007-09-03 15:18:33
date last changed
2017-01-01 06:45:02
@article{15f75610-c9b2-4ee7-b8d1-7713f592c71b,
  abstract     = {Effects of core-level degeneracies on X-ray photoemission spectra are considered theoretically and computationally. Processes within each degenerate sub-level manifold are treated by a leading-order cumulant approximation, and processes which connect spin-orbit or crystal-field split levels to leading order in the core-electron self-energy. The cumulant approximation is consistent with earlier asymptotic results and correctly describe the leading moments of the core-electron spectrum. The central quantity in both cases is an exponent function which may be expressed in terms of projected state densities and core-valence Coulomb matrix elements. Numerical results are presented for the Al L-2.3 and the Rh and Pd M-4.5 levels and compared with recent experiments. In the case of Rh M-4.5, the level-dependent effects are strong leading to an increased asymmetry, a much increased lifetime width of the M-4 level, and deviation from Lorentzian lifetime broadening. In Pd, the effects are much weaker owing to a much smaller Fermi-surface d density of states at the core-hole atom, and it is almost negligible in Al, the most noticeable effect being an increased width of the lower L-2 component. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Almbladh, Carl-Olof and Birgersson, Martin},
  issn         = {0368-2048},
  keyword      = {core-level spectra,many-body effects},
  language     = {eng},
  pages        = {393--399},
  publisher    = {Elsevier},
  series       = {Journal of Electron Spectroscopy and Related Phenomena},
  title        = {Effects of core-level degeneracies on core-level spectra},
  url          = {http://dx.doi.org/10.1016/j.elspec.2004.02.117},
  volume       = {137-40},
  year         = {2004},
}