The photosensitive iron transition group impurities Fe, Ni, and V in cubic ZnS and Ni in ZnO have been studied by electron paramagnetic resonance. The charge states Fe³⁺, Fe⁺, Ni³⁺, and V³⁺ were observed after excitation with ultraviolet light, and, in the case of Ni³⁺, after excitation with blue light. The magnetic properties are those to be expected for a 3d⁷ (Fe⁺ and Ni³⁺) and a 3d² (V³⁺) configuration in tetrahedral coordination. The quantitative features of the spectra reflect the systematic variations produced by covalency.
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Holton et al. (1964) studied this question.
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