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A survey of recent analyses of Sc II, Ti II and Fe II and of other spectra of the singly-ionized iron-group elements demonstrates that the "horizontal" regularities first described by Catalán are valid for several kinds of excited configurations. From systematic parametric studies it is shown that the radial parameters have a smooth dependence on k for 3 d k -1 4 s 4 p , 3 d k 4 d and 3 d k 4 f configurations. From these results the position and level structure of unknown configurations can be predicted.
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Johansson et al. (1980) studied this question.
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