Abstract

The low even levels of Th i and Th ii are interpreted by using the Slater–Condon parametric method and by taking into account recent results obtained by using Fourier-transform spectrometry. Several levels of 6d4, starting with 5D0 at 21176.01 cm−1, are identified in Th i. The eigenfunctions in intermediate coupling are applied to the phenomenological interpretation of the isotope shifts in both spectra.

© 1988 Optical Society of America

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