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Two-electron transitions and their importance for lifetimes of levels of configuration 2p43p in K XI

Energy spectra of the ground configuration and the first four excited configurations of fluorine-like potassium K XI have been calculated using the configuration interaction method. The wavelengths and transition probabilities of one-electron and two-electron transitions are obtained ab initio. The probabilities of one-electron transitions 2s22p43p–2s22p43s and two-electron transitions 2s22p43p–2s2p6 for determination of lifetimes of the levels of configuration 2s22p43p are used. The calculated results are compared with the recent experimental data and other theoretical results.