The 2p43s, 3d, 3p, and 4sConfigurations of Doubly Ionized Sodium, Na III

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Abstract
The spectrum of doubly ionized sodium, Na III, has been studied in the 2 500-1 300 Å range and the analysis revised and extended as regards the 2p44s, 3p, and 3d configurations. The number of classified lines is now 177, out of which 110 are newly observed and classified. Some of the older classifications have been altered and about 80 lines rejected as spurious. The following terms and levels are new: (3P) 4s4P, 2P, (1D)4s2D1½, (1S)4s2S, (1D)3p 2F, 2D, 2P, (1S)3p 2P, (3P)3d 4F (some levels now ascribed to 3d4F were known but with other designations), (3P)3d 4P, 2F2½, and (1D)2G, 2F, 2D1½. The 2p43s, 3p, 3d, and 4s configurations are now complete. Newly observed and interpreted intercombination lines lead to accurate relative positions of level groups with different multiplicities or different parents. The new level values derived are estimated to be internally consistent to about 0.1-0.15 cm-1 for (3P)3s, 3p, and 3d and also for (1D)3s, 3p, 3d. The accuracy of the (3P)4s levels in relation to (3P)3s, 3p, 3d and that of (1D)4s in relation to (1D)3s, 3p, 3d should be about ± 0.2 cm-1. The coupling conditions have been analyzed using Condon-Slater theory. The 2p43s, 3p, 3d, and 4s configurations are best described with LS symbols; deviations occur for some 3p levels, and some 3d levels are heavily mixed.

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