EFFECTS OF ELECTRON CORRELATIONS ON AUGER-ELECTRON AND APPEARANCE-POTENTIAL SPECTRA OF SOLID-SURFACES

Autor(en): POTTHOFF, M
BRAUN, J
NOLTING, W
BORSTEL, G
Stichwörter: BAND METALS; Chemistry; Chemistry, Physical; ORBITAL DEGENERACY; Physics; Physics, Condensed Matter; TRANSITION-METALS
Erscheinungsdatum: 1994
Herausgeber: ELSEVIER SCIENCE BV
Journal: SURFACE SCIENCE
Volumen: 307
Ausgabe: B
Startseite: 942
Seitenende: 946
Zusammenfassung: 
In the past the Cini-Sawatzky model and its generalizations to arbitrary band-filling and orbital degeneracy have been employed extensively in the discussion of electron-correlation effects in CVV Auger-electron (AE) and appearance-potential (AP) spectra of solid surfaces. In all these attempts, however, the strong inherent perturbation of the valence-band system due to the core-hole potential has been neglected up to now. We present results of a new theoretical approach for arbitrary band-filling, which for the first time accounts for the on-site Coulomb interaction among the valence-band electrons U and for the Coulomb interaction between valence-band and core electrons U(c) as well. The AE- and AP-intensities are given by a three-particle Green function, which is calculated using a diagrammatic vertex-correction method. The spectra show a strong dependence on the valence-band-core interaction U(c) and exhibit several satellite features in the strong-correlation case. They indicate the importance of an accurate description of the effects of the core-hole potential for AE- and AP-spectra of solids.
Beschreibung: 
13th European Conference on Surface Science (ECOSS-13), UNIV WARWICK, ARTS CTR, WARWICK, ENGLAND, AUG 30-SEP 04, 1993
ISSN: 00396028
DOI: 10.1016/0039-6028(94)91520-2

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