Multiplet Structures of Resonant Photoemission Spectrum in Cuprous Halides

Abstract

Multiplet structures of the resonant photoemission spectrum are studied in cuprous halides on the basis of an impurity Anderson model. The formation of trion (the bound state of two 3 d -holes and one conduction electron) with multiplet structures is discussed as an origin of sharp satellite peaks coexisting with Auger peaks above the 3 p -core-level photothreshold. It is shown that a small mixing of the d 9 -electron configuration to the d 10 -electron configuration of Cu atom in the ground state is important for non-vanishing intensity of the satellite far below the photothreshold. Halogen's p -levels are found to affect considerably the satellite spectrum through the mixing to Cu's 3 d -levels, leading to the spectral shape of CuCl different from that of CuI.