Shake processes in the Auger decay of resonantly excited 3$d^9$4$s^2$4$p^6$np states of Kr

The spectra of Auger-like electrons of Kr have been studied in detail in the photon energy range of the 3$d_{3/2}$ and 3$d_{5/2}$→np (n=5,6,7,8) excitations. In addition to the 3$d^{\mathrm{-}1}$np→4$p^{\mathrm{-}2}$np spectator Auger-like lines the spectra show structures where the spectator electron is shaken up or down during the decay. Their contribution is found to increase in going to the excitations to higher Rydberg orbitals. Shake calculations are found to agree fairly well with the observed shake contributions.