Configuration Interaction and Screening in Core-Level Spectroscopy of Solids

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Abstract
This paper deals with systems which show complicated line‐shapes in core‐level spectroscopies. The emphasis is on photoelectron spectroscopy. The aim is to give a simple picture of the processes behind such complex line‐shapes and to describe their relevance as a possible diagnostic tool for study of the electronic structure of solid state materials. It will be shown that the complex line‐shapes, with two or more peaks, arise when core‐hole screening involves nearly localized valence electrons: i.e. electrons for which the ratio of the effective Coulomb interaction, Ueff, to the band‐width, W, is nearer to infinity than to one. This condition is commonly met in the early lanthanides, the actinides, and some adsorbate systems. The phenomena will be explained within the formalism of configuration interaction, and a screening model which is physically, if not formally closely related.

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