Effect of intermediate coupling on angular distribution of Auger electrons

The Auger decay anisotropy parameter ${\mathrm{\alpha }}_2$ of angular distribution has been calculated for the ${\mathit{M}}_{45}$-NN transitions in Kr and ${\mathit{M}}_{45\mathrm{-}}$NN and ${\mathit{N}}_{45\mathrm{-}}$OO transitions in Xe atoms using the multiconfiguration Dirac-Fock model in intermediate coupling with configuration interaction. For transitions involving many contributing partial waves and leading to the strongly mixed final ionic states in intermediate coupling, the effects of relativity and spin-orbit interaction are found to be quite important for the calculations of ${\mathrm{\alpha }}_2$ values. The existing discrepancies between theory and experiment are largely removed by the present relativistic intermediate coupling calculations.