By using a pulsed hollow-cathode discharge, metastable atoms are produced in the (2p⁵3s3p)⁴{D}7/2$ and (2${p}⁵$3s3p)${}⁴S3/2 levels of Na i. A tunable laser is used to excite these atoms to levels in the 2p⁵3s3d and 2p⁵3s4s configurations, and thereby to establish a partial Grotrian diagram for the quartet system. Several possible Na i xuv laser systems are described.
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Holmgren et al. (1985) studied this question.
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