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The Spectrum of Singly Ionized Sulphur, S II

The spectrum of S II from a sliding spark discharge has been recorded from 9650 Å to 550 Å. The wavelengths of 573 lines in the air region and 294 lines in the vacuum region were measured. Energy levels have been established or revised in the following configurations: 3p4, 4s-7s, 4p-5p, 3d-7d, 4f-7f and 5g. Most of these configurations have been studied by means of ab initio calculations or least-squares fits. The ionization limit 3s23p2 3P2 189 066 ± 2 cm-1 was calculated from f and g levels.