Excitation energies and oscillator strengths for the allowed transitions 2p43P to 2s2p53P0and 2p41D,1S to 2s2p51P0in the O I isoelectronic sequence

Excitation energies and oscillator strengths for the allowed transitions 2p 4 3 P to 2s2p 5 3 P 0 , 2p 4 1 D to 2s2p 5 1 P 0 and 2p 4 1 S to 2s2p 5 1 P 0 have been calculated in LS coupling for 17 species in the oxygen isoelectronic sequence (from O I to Kr XXIX), using configuration interaction wavefunctions in the computer program CIV3. The configurations included represent the internal-, semi-internal- and all-external-type correlations. Excitation energies were also calculated while including the first-order relativistic corrections. With these corrections, the disagreement between calculated and experimental values is less than 1% for two-thirds of the transitions studied. The maximum difference is 2.6% for transition 1 S to 1 P 0 in Ne III. The present oscillator strengths in the length and velocity formulations are compared with previous work.