Abstract

In the present paper, we report on consistent crystal field calculations of the Cr 3+ ions energy levels in KAl(MoO 4) 2 using actual D 3d site symmetry of the Cr 3+ position and employing the exchange charge model (ECM) of the crystal field. In addition to the energy level calculations, the Huang–Rhys factor S=5.7 and effective phonon energy ℏ ω=268 cm –1 were evaluated in the single configurational coordinate model. Detailed treatment of the microscopic crystal field effects in the ECM framework allowed to obtain analytical dependence of the crystal field strength 10 Dq on the Cr–O interionic distance and extracting from it the values of some parameters of the electron–vibrational interaction (EVI) in the KAl(MoO 4) 2:Cr 3+ system. All obtained results are compared with experimental data and discussed; agreement between the calculated and experimental parameters is good.

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