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Lecture Paul S. Bagus

Roster

WhenWhere
21 November 2003 FWN-Building 5116.0107, Nijenborgh 4, 9747 AG, Groningen
Speaker:Prof. P.S. Bagus
Affiliation:Department of Chemistry, University of North Texas, Denton, TX, USA
Title:Many-body effects for the XPS of transition metals: physical insight from configuration interaction theory
Date:Fri Nov 21, 2003
Start:11.00
Location:FWN-Building 5116.0107
Host:R. Broer
Telephone:+31 50 363 4374

Abstract

One-electron models cannot explain the XPS spectra of transition metal, TM, atoms and cations. Many-body, electron correlation, effects make major contributions to these spectra, both for energies and intensities. Previous work on atomic many-body effects for the Mn 3s XPS is reviewed in order to show that configuration interaction wavefunctions provide a transparent way to understand the reasons that many-body effects can lead to such dramatic effects. In particular, the existence of a frustrated Auger configuration, FAC, is shown to be a necessary condition for large many-body contributions. A previously neglected class of FAC's is introduced and shown to improve the accuracy of the theoretical spectra and to predict new satellite structure.1 The concepts presented, although applied to a specific case, are of general importance for TM XPS.

1. Paul S. Bagus, R. Broer, and E. S. Ilton, "A New Near Degeneracy Effect For Photoemission In Transition Metals", Phys. Rev. Lett., submitted.

 

Last modified:22 October 2012 2.30 p.m.