The shapes of Auger decay lines in photoelectron satellite spectra

The theory of the shapes of Auger decay lines of satellite two-hole-one par ticle states accompanying photoionization based on the Green's function met hod is developed. The lineshapes of Auger decay of satellite states [2s2p]( P-1,P-3)3s(P-2), [2s2p](P-1)4s(P-2) and [3s3p](P-3)4s(P-2) in valence p-pho toelectron spectra of Ne and Ar atoms are calculated (hole states are indic ated by square brackets throughout). It is shown that in some cases the Aug er lineshapes reproduce the shape of the photoelectron satellite line, but in other cases Auger line may be narrower then the photoelectron line and m ay have opposite direction of asymmetry. The theoretical results are in agr eement with experimental low-energy Auger spectra.