The spectrum of doubly ionized sodium has been excited by an electrodeless discharge. Wave-length measurements have been made in the region from 500 to 2600A. On the basis of these determiniations it has been possible to establish 30 new levels arising from the 2s²2p⁴3p, 2s²2p⁴3d, and 2s²2p⁴4s configurations.
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D. H. Tomboulian (1938) studied this question.
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