Optical studies on the absorption and emission of $3d$ impurity ions in MgF₂ are reported. It is found that the spin-forbidden transitions for these impurities are greatly enhanced by the presence of radiation defects. The spin-allowed transitions are not similarly enhanced. The sharp line structure accompanying several of these transitions is discussed as is the annealing of the radiation damage.
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Yun et al. (1973) studied this question.
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