Abstract
¯ 3m) with Zn 21 ions occupying sites of T3d symmetry. It is presumed that Co 21 substitutes for Zn 21 during the crystal-growth process. The observed spectra of Co 21 are analyzed, and the identified energy levels are compared to calculated levels derived from lattice-sum models and the crystal-field, three-parameter theory. Twenty-six experimental Stark ~electronic! energy levels of Co 21 (3d 7 ) are compared to calculated levels with a final rms deviation of 26 cm 21 . The atomic parameters for Co 21 (3d 7 ), including the Slater, spin-orbit, and interconfigurational parameters, are in general agreement with the corresponding parameters obtained for divalent cobalt in other host crystals. The initial crystal-field parameters Bnm determined from the lattice-sum calculations represent an excellent starting set for the splitting analyses and undergo only modest changes to a final set of parameters. Comments are also made in relation to the use of the crystal as a saturable absorber for near-infrared Q-switched solid-state lasers.
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