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The multiconfiguration optimised potential model has been applied to the first six elements of the gallium sequence. The structure of the 2 P ground state as well as of the two lowest 2 S and 2 D terms has been calculated along with the gf values for the 2 P- 2 S and 2 P- 2 D transitions. Irregularities in the isoelectronic behaviour of the gf values owing to plunging terms of the 4s4p 2 configuration are accounted for and comparison is made with recent experiments. Some discrepancies between theory and experiments have been cleared up but some still remain.
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Aashamar et al. (1983) studied this question.
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