Abstract
An analysis of Ni II based on 4300 observed lines is presented. The low structures are 3d 9 , 3d 8 4s and 3d 7 4s 2 which are now complete except for 3d 8(1S)4s 2S and 3d 7 4s 2 2P½ and the higher of the two 2D terms of 3d 7 4s 2. Long series occur such as 3d 84s to 9s, 4d to 8d, 4f to 7f, 5g to 7g. The analysis also includes many terms of the complex structure 3d 7 4s 4p but only 55 percent of the levels within reach of the hollow cathode source have been found. The identification of the levels of 3d 8 4d and 5d was assisted by the calculations of N. Spector. The 4d 7 4s 2 levels were calculated by Y. Shadmi, who also provided calculated positions for all the levels of 3d 7 4s 4p without which much of the analysis would have been impossible. The 3d 8 ns and 3d 8 nd series give a limit of 146532.0 but the 3d 8 ng series gives 146541.56. The latter has been adopted though no explanation of the discrepancy has been found.
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