Abstract
The multi-configuration Hartree-Fock method, extended to include relativistic effects in the Breit-Pauli approximation (MCHF+BP), has been applied to the study of some forbidden transitions between levels of the 3s23p3 configuration in the phosphorus sequence. Term energy separations, fine-structure splittings, and E2 and M1 transition rates are reported for S II of interest in astrophysics and for several atomic systems with nuclear charge, Z, in the range 28<or=Z<or=42, where lines have been observed in laboratory plasmas. The results are compared with values derived from observation and with other theories.
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