Abstract
In this paper we present theoretical study of Ce2+ impurity centres in alkaline earth fluoride crystals (CaF2, SrF2). Only cubic configurations of centres were considered. Electronic levels and related properties were studied using CASSCF/CASPT2 approach within embedded-cluster formalism including scalar relativistic corrections and spin-orbital interaction. Calculated absorption spectra for Ce2+ in CaF2 and SrF2 are in good agreement with experimental data. For both crystals the ground state of Ce2+ ion has predominantly 4f15d1 singlet character.
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