Abstract

For configurations with large numbers of levels, such as the fNd configurations of the lanthanides, the theoretical calculations are often restricted to the levels built on a few terms of fN. As part of an effort toward getting better intermediate-coupling eigenfunctions we have considered the whole f6d (and f8d) configuration, which involves 2492 levels for J = 1/2 to 17/2. The matrices of the coefficients for the usual electrostatic and spin-orbit parameters have been computed, as well as for some second-order parameters. A method has been devised to check these matrices in the computer. The study of the energy levels of the 4f85d6s2 configuration of Tb i is presented. For the 45 known levels the mean deviation obtained is 41 cm−1. The intermediate-coupling eigenfunctions are used for the analysis of the hyperfine structure.

© 1978 Optical Society of America

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