Auger and XPS spectra provide 3 types of information : 1. peak energy shift informs on chemical environment of the emitting atom ; 2. peak intensity depends on local geometry effects ; 3. peak shape depends on coupling effects between the core hole and the metal excitations. The purpose of this paper is to study influence on XPS peak shapes of different coupling effects : optical excitation ; phonon creation ; electron-hole creation ; electronic correlations. Peak shape I(E) and broadening function f(E) are expressed taking into account these effects.
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