Energy levels and probabilities of radiative transitions in the Kr IX ion.

The energy levels of the 3 d4 l ( l = 1-3) and 3 p3 d4 l ( l = 0, 1) configurations in the Kr IX ion and the probabilities of radiative transitions to the ground state from these excited states have been calculated within the relativistic perturbation theory using a zero-approximation model potential. The results are shown to be stable within this approximation. The well-known problem of anomalously low accuracy of the calculations of some higher lying singlet levels is considered. [ABSTRACT FROM AUTHOR]