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The thermal shifts of R 1  and R 2  lines in Cr 3+ -doped forsterite (Mg 2 SiO 4 ) are studied by considering both the static contribution due to lattice thermal expansion and the vibrational contribution due to electron-phonon interaction. In the studies, the thermal expansion coefficient of the Cr 3+  center is assumed reasonably as that of the corresponding cluster in the host crystal. The results suggest that for R 1  and R 2  lines the static contributions are opposite in sign and in magnitude about 37% and 45%, respectively, of the corresponding vibrational contributions. The true electron-phonon coupling coefficients α' (obtained by considering both contributions) increase by about 58% and 81%, respectively, for R 1  and R 2  lines in comparison with the corresponding parameters α obtained by considering only the vibrational contribution. It appears that for the reasonable explanation of thermal shift of spectral lines and the exact estimation of electron-phonon coupling coefficient, both the static and vibrational contributions should be taken into account

Investigations of the Thermal Shifts and Electron–Phonon Coupling Parameters of R 1 and R 2 Lines for Cr 3+ -doped Forsterite