Angular distributions of electrons in resonant Auger spectra

Recent measurements have shown that the angular distribution of Auger electrons observed in near threshold resonant excitation with energy resolution adequate to partially resolve the multiplet structure corresponding to final core states exhibited a marked change in the angular distributions as a function of final electron energy. A method of calculating these angular distributions is proposed that extends the formalism developed for treating angular distributions in photoeffect via a separation into parity-favored and -unfavored components. As an example of the use of the method, calculations are presented for the 2p-4s resonant Auger process in argon and compared with recent experiments.