Channel interaction and relaxation effects in XeN4,5OOAuger transitions

The multichannel multiconfiguration Dirac-Fock method has been used to study the final-continuum-state configuration interaction (FCSCI) and relaxation effects in Xe ${\mathit{N}}_{4,5}$OO Auger-electron spectrum. FCSCI has been found to cause a drastic intensity redistribution and an 11% reduction of the total transition rate. The relaxation effect has been calculated in the full many-electron picture by using separately optimized initial- and final-state orbitals. The relaxation effect varies from an 8% increase to a 16% decrease of transition rates. The dominant contribution to the relaxation is found to come from the contraction and expansion of orbitals of participating electrons and from the conjugate Auger amplitudes.