Abstract
The optical absorption lineshape has been calculated for the dipole-allowed 1S0 → 1P1 band in the Ge2+ center in alkali halide crystals by means of the Monte Carlo integration method. The calculated spectra are compared with the C band spectra observed in KCl:Ge2+ at 16 and 290 K. A good fit to the observation is obtained by taking into account the off-centrality of the Ge2+ ion in addition to the quadratic electron-lattice interaction with the T2g vibrational mode. It is suggested that the Ge2+ ion is at the off-center position at low temperatures like 16 K but is displaced into the on-center position with increasing temperature.
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