Abstract

The absorption spectra of UCl2- 6 diluted into the cubic lattices Cs2ZrCl6 and Cs2SnCl6, and of UBr2- 6 diluted into Cs2ZrBr6 have been measured at liquid helium temperatures. The derived energy levels, together with earlier luminescence measurements have been used to evaluate the crystal-field, spinorbit coupling, inter-electron repulsion and Trees correction parameters and the corresponding eigenvalues. Several of the states are derived from an almost equal admixture of two or more Russell-Saunders terms. Some magnetic properties are also computed and discussed.

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