Abstract
The exchange charge model of crystal field (which includes the covalent effects) is used to analyze the energy level schemes of Cr3+ ion in ZnAl2S4 and ZnGa2O4 crystals with spinel structure. Calculations of the overlap integrals and crystal field parameters were performed before getting the Cr3+ energy levels. The calculated energy level schemes are compared with available experimental data; a new interpretation of the absorption peaks is suggested.
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