Abstract
In this paper, formulas for the optical spectrum and the gyromagnetic factor for d 7 ions in T d symmetry with a slight triangle perturbation are established by using a covalent model, in which the covalence contribution has been considered. Using the model, we have calculated the optical spectra and the g -factor of CdS : Co 2 + . The calculation results agree well with the experimental findings. It suggests that covalent model should be adopted for the calculation of the optical spectrum and the EPR parameters for Co 2 + ion in covalent crystal.
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