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A calculation of the Auger spectrum for an initially filled simple-cubic tight-binding s band is presented. The spectra are obtained for various values of the Coulomb correlation energy as compared to the one-electron bandwidth. The results are compared to various approximate Auger line shapes. The Auger line shape is found to be strongly dependent on the Coulomb interaction between the two holes in the final state and deviate strongly from the self-convolution of the density of states even for small Coulomb interactions.
Sawatzky et al. (Sat,) studied this question.