Abstract
Optical absorption spectra of Ge2+ ions in KCl and KBr crystals have been investigated in the temperature range 15-300 K. In the triplet-structured spin-orbit-allowed C band, the C1-C2 band splitting was observed to be larger than that of the C2-C3 band at low temperatures, while the two become equal to each other with increasing temperature. The absorption lineshape has been calculated, by means of the Monte Carlo integration method, for Ge2+ ions with a linear electron-lattice interaction and tetragonal crystal field. Comparing the calculated lineshape with the observed spectra, we conclude that the Ge2+ ion is at the off-centre position with the tetragonal field at low temperatures, but is moved into the on-centre position with increasing temperature.
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