Abstract
The electron-phonon interaction causes a spectral thermal shift (TS) in crystals with impurities. In this paper we develop an approach to calculate the different contributions to the TS of MgO:V2+ in detail; these include Raman scattering, the direct process and the optical branch. It is found that the direct process plays a predominant role in the TS. Moreover, the TS caused by thermal expansion is interpreted and calculated using the theory of the pressure-induced spectral shift. Taking account of the contributions, we calculated the R-line TS of MgO:V2+ by fitting the experimental data. Our results show good agreement with the TS experimental data and other experimental data for MgO:V2+.
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