1. “Endor investigation of a V_F center in natural CaF₂ crystals”
   H. Bill, J. Mareda
   Chem. Phys. Lett. 1975, 36, 218-221.

This note reports ENDOR measurements performed on a V_F center in natural CaF₂ crystals. It consists of an F₂⁻ molecule ion associated with an Na⁺ ion. The presence of the Na⁺impurity seems to be characteristic of the yellow fluorites.

DOI : 10.1016/0009-2614(75)87019-9 

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