The method of superposition of configurations has been used to obtain accurate oscillator strengths and transition probabilities for transitions between the 3s 2 3p 5 2 P° ground state and the 3s3p 6 , 3s 2 3p 4 3d and 3s 2 3p 4 4s states of doubly-ionized potassium, triply-ionized calcium and four-times-ionized scandium. The CIV3 code was used to perform calculations both in LS coupling and in intermediate (or LSJ ) coupling, using an extensive set of correlation configurations. The present results are believed to be the most accurate available and are compared with previous theoretical work.
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Wilson et al. (2000) studied this question.
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