Optical absorption of s2configuration ions in alkali halide crystals: I. Lineshape of the A band in In+-doped crystals

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Abstract
The lineshape of the A band in KBr:In+ and KCl:In+ has been measured as a function of temperature from about 16K to room temperature. The shape of the A band is well accounted for at low temperatures by a model that allows for spin-orbit coupling, vibrational coupling of the mod A), mod B) and mod C) states, and the dynamical Jahn-Teller effect in the perturbed mod A) state. The principal factor governing the lineshape is the coupling with modes of T2g symmetry but agreement with the experimental results is much improved by a convolution of this calculated lineshape with a Gaussian function which represents the interaction with modes of A1g symmetry. The model fails, however, to account satisfactorily for the relative peak heights of the two components of the A band at high temperatures.