A microscopic semi-empirical model is presented for reconstructing the local structure of the tetragonal (C 4v ) symmetry centre of a trivalent rare-earth ion in a fluorite lattice from phenomenological crystal field parameter value. The model is used to study Er 3+ in CaF 2 and satisfactory agreement with ENDOR data is obtained.
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K Lesniak (1986) studied this question.
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