Effects of core-level degeneracies on core-level spectra
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/273870
- author
- Almbladh, Carl-Olof LU and Birgersson, Martin LU
- organization
- publishing date
- 2004
- 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
- 2016-04-01 15:42:26
- date last changed
- 2022-01-28 06:38:34
@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}},
keywords = {{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}},
doi = {{10.1016/j.elspec.2004.02.117}},
volume = {{137-40}},
year = {{2004}},
}