Optical absorption of s2configuration ions in alkali halide crystals: II. Lineshape of the C band in KBr:In+

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Abstract
For pt.I see ibid., vol.8, p.851 (1975). The lineshape of the C band in KBr:In+ has been measured as a function of temperature from 21K to room temperature. The band does not display obvious fine structure at any temperature but the appearance at the higher temperatures of two shoulders in addition to the main peak indicates a triplet structure. The lineshape of the C band is accounted for quantitatively in terms of a model that includes spin-orbit coupling, vibrational coupling to the mod A) and mod B) 11 0BC 2K state. The asymmetry of the C band is due to the states, the dynamical Jahn-Teller effect due to the trigonal T2 gamma modes and coupling to modes of A1g symmetry, in the perturbed mod C) state. The asymmetry of the C band is due to the quadratic terms in the Hamiltonian and although such terms would also arise from a difference in force constants in the ground and excited states, it is not necessary to introduce this effect to account for the lineshape in KBr:In+.