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Using the measurements made by Carroll of the vacuum spark spectrum of thallium, combinations of the triad of triplet and singlet F, D, P terms of the d 9 p configuration of Tl IV with the deeper 3 D and 1 D of the d 9 s state have been found. Justification of the scheme is sought by comparison with similarly constituted spectra.
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K. Ramachandra Rao (1928) studied this question.
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