  Supercell method is used to study the relaxation and screening effects during
the Auger transition in metals. In order to make the interaction between the
core-holes sited at different atoms negligible, the real metal is simulated by
supercells repeated periodically. The electronic states concerned by the Auger
transition are calculated by using FLAPW method. The occurrence of both
bandlike and quasi-atomiclike Auger spectra across transition metal series is
related clearly to the different responses of these metals to the existence of
a core-hole depending on whether their d-bands are partially or completely
filled. As examples, L_3VV and M_1VV Auger spectral profiles of Cu have been
calculated in a reasonably well agreement with experiment. The hole-hole
interaction is considered explicitly in the calculation to give the
multi-splitting in the quasi-atomiclike Auger spectra.

Strongly Correlated Electrons