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It is shown, both qualitatively and quantitatively, that the n dependence of the singlet-triplet splitting of the singly excited HeI-like spectra follows the theoretical law Sigma nu =0 l a nu (l,Z)/n 2 nu +3 in contrast to the n -2 dependence suggested empirically by Elden and Lofstrand (1970).
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T. N. Chang (1974) studied this question.
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