Abstract
Calculations based on well-known relations which have been derived from the vector model show a considerable difference between the multiplet separations in the configurations 4 f x 6 s 2 and 4 f x−1 5 d6 s 2 of some neutral rare earth spectra. They allow in some cases to conclude on the character of the ground state from only a few intervals found between most prominent lines. Applied to the case of Terbium I the ground configuration of this spectrum turns out to be 4 f 85 d6 s 2. A few low levels are given. The calculations are extended to the ground terms of Tb II 4 f 85 d6 s 9 H and 7 H and their relative positions are estimated. Empirical regularities can be interpreted in accordance with the results on Tb I. Levels of both 9 H and 7 H are found.
Published Version
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