RYDBERG SERIES IN BE-LIKE IONS (1S(2)2LNL', N=5-12)

Energy levels associated to 1s(2)2lnl' (n = 5-12, l' = 0-4) configurations for different ions were calculated by using the perturbation theory method (MZ code). We computed the energy of 1s(2)2pnl states counted from the threshold (1s(2)2s) in order to find out the first n for which 1s(2)2pnl states become autoionizing states for different ions. Only one radiative channel (1s(2)2lnl'-1s(2)2l2l') was considered numerically. For O4+ both energy and transition probabilities, for n = 5 and 6, were computed by two methods: MZ and multi-configurational Hartree-Fock. For 1s(2)2pnl-1s(2)2s (n = 6-12), the transition energies were obtained for identification of experimental spectra of Coster-Kronig electrons which have been observed for C- and O-like ions in low-energy collisions experiments.