Influence of the initial- and final-state configuration interaction on the anisotropy of the resonant Auger decay of Kr 3d⁻¹5p and Xe 4d⁻¹6p states

The anisotropy of resonant Auger decay of photo-excited Kr 3d−13/2,5/25p and Xe 4d−13/2,5/26p states has been studied by multiconfiguration Dirac-Fock method. The calculations account for the configuration interaction both in the initial and in the final states of the Auger decay. For the nonresolved nd−1(n+2)p(J=1) resonances (n=3 for Kr and n=4 for Xe) the average intensities and anisotropies of Auger lines were calculated by weighing each partial rate by the pertinent Dirac-Fock photoexcitation probabilities. Our results show that, in addition to the initial- and final-state correlation, both the relaxation and the exchange interaction have a substantial effect on the anisotropy of these Auger spectra. For most Auger lines there is good agreement between our calculated β parameters and experimental values for the Kr and Xe nd−15/2(n+2)p photoexcitation resonances; there is also satisfactory agreement for the Kr 3d−13/25p and Xe 4d−13/26p resonant Auger spectra. However, the remaining notable discrepancies between theory and experiment indicate that important correlation effects are still omitted in our calculations. Discrepancies between different experimental results stress the need for further improvements on the experimental side