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) configurat ions for different ions were calculated by using the perturbation theo ry method (MZ code). We computed the energy of 1s(2)2pnl states counte d from the threshold (1s(2)2s) in order to find out the first n for wh ich 1s(2)2pnl states become autoionizing states for different ions. On ly one radiative channel (1s(2)2lnl'-1s(2)2l2l') was considered numeri cally. 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 e lectrons which have been observed for C- and O-like ions in low-energy collisions experiments.