AB-INITIO CALCULATION OF E1 TRANSITIONS IN THE OXYGEN ISOELECTRONIC SEQUENCE

The electric dipole (E1) transitions between the levels of the 1s(2)2s (2)2p4, 1s(2)2s2p5 and 1s(2)2p6 configurations have been considered in the oxygen isoelectronic sequence. The second-order stationary pertur bation theory of the effective Hamiltonian has been adopted. Relativis tic corrections were included in the Breit-Pauli approximation. E1 tra nsition energies, line strengths, oscillator strengths, probabilities and lifetimes obtained in various approximations are compared with exp erimental values and with results of other theoretical calculations fo r Z = 10 - 26.