ELECTRON HOLE INTERACTION IN DEEP LEVEL SPECTRA

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Abstract
Optical absorption, reflection and photoelectric yield spectra of solids in the vacuum ultraviolet are shaped by both one-electron interband transitions and excitations to bound electronhole states. In addition, the electron-hole interaction can also modify or even determine the shape of the spectra above the ionization limit. The identification of electron-hole effects is of fundamental importance for the interpretation of the spectra and also for the correct extraction of bandstructure information. Recent progress in this respect for insulators, semiconductors, and metals is described. The role of the electron hole interaction for surface excitations is also briefly discussed

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