Line Shape of C Bands in Alkali Halide Phosphors by the Method of Moments

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Abstract
We have derived the optical absorption line shape for C bands in alkali halide phosphors by the method of moments. The dynamic Jahn–Teller interaction is considered in the excited T1u electronic states. This interaction is taken to be linear in the lattice displacements. The obtained line shape exhibits asymmetric triplet structure even in the linear electron–lattice interaction. The use of the quasi-classical approach (i.e. the use of the adiabatic approximation and Franck–Condon principle) for electronic transition to orbitally degenerate states is discussed by comparing the line shapes obtained in this approach with those obtained by the method of moments.

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