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Traditional ligand-field theory has to be improved by taking into account both pure electronic contributionand electron-phonon interaction one(including lattice-vibrational relaxation energy).By means of improved ligand-fieldtheory,the R-line,t_2~(32)T_1 lines,t_2~2(~3T_1)e~4T_2,and t_2~2(~3T_1)e~4T_1 bands,ground-state g factor,four strain-induced level-splittings,and R-line thermal shift of MgO:Cr~(3+)have been calculated.The results are in very good agreement withthe experimental data.It is found that for MgO:Cr~(3+),the contributions due to electron-phonon interaction(EPI)comefrom the first-order term.In thermal shift of R-line of MgO:Cr~(3+),the temperature-dependent contribution due to EPIis dominant.
Traditional ligand-field theory has to be improved by taking into account both pure electronic contribution and electron-phonon interaction one (including lattice-vibrational relaxation energy) .By means of improved ligand-field theory, the R-line, t_2 ~ (32) T_1 lines, t_2 ~ 2 (~ 3T_1) e ~ 4T_2, and t_2 ~ 2 (~ 3T_1) e ~ 4T_1 bands, ground-state g factor, four strain- induced level- splittings, and R- line thermal shift of MgO: Cr ~ (3+) have been calculated. The results are in very good agreement with the experimental data. It is found that for MgO: Cr ~ (3 +), the contributions due to electron-phonon interaction (EPI) comefrom the first- order term.In thermal shift of R-line of MgO: Cr ~ (3 +), the temperature-dependent contribution due to EPI dominant.