Calculation of transition probabilities for two-electron one-photon and hypersatellite transitions for ions with two vacancies in the K shell

Transition probabilities have been calculated for two-electron one-photon K alpha alpha transitions (2s2p to 1s 2 ) and single-electron K alpha h hypersatellite transitions (2p to 1s) for ions with two K-shell vacancies in the initial state. The ions studied are N, Ne, Al, Cl, Ca, Fe and Ni. The K alpha alpha and K alpha h rates were calculated within a single-particle atomic model, allowing for the relaxation of the single-particle orbitals when passing from the initial to the final state. The LS-coupling scheme and non-relativistic single-configuration Hartree-Fock wavefunctions were used to calculate oscillator strengths in the dipole-length approximation.