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Radiative transition probabilities are calculated for the forbidden lines in the ground configuration 1s2 2s2 2p6 3s2 3p4 of all the members of the sulphur isoelectronic sequence up to Ni XIII. The method is based on the same elaborate procedures as those used in recent studies on the configurations 2p3, 3p3 and 3p2 by the present authors. The calculated level structure agrees with experiment to better than 6 per cent throughout the sequence, and the overall agreement between the present transition probabilities and values calculated previously by semi-empirical methods is good.
Mendoza et al. (Fri,) studied this question.