1999A&AS..135..159M

Radiative decay rates are computed with the atomic structure code superstructure for the 2s2p^{3 5}S^o₂ - 2s²2p^{2 3}P₁, ³P₂ and ¹D₂ intercombination transitions of the carbon isoelectronic sequence (6 ≤Z ≤28). Contributions from configuration interaction and relativistic corrections are carefully studied, in particular the spin-spin interaction that is shown to be of considerable importance for low Z. By extensive comparisons with other theoretical datasets and measurements of the ⁵S^o₂ radiative lifetime and the B=A(⁵S^o₂ - ³P₂)/A(⁵S^o₂ - ³P₁) branching ratio, we are able to assign accuracy ratings to the present transition probabilities. The transitions to the ground term are believed to be accurate to better than 10% whereas the smaller A-values belonging to transitions to the ¹D₂ are not expected to be accurate to more than 20%.