Abstract
AbstractThe stress‐induced dichroism of the UV‐absorption bands of KCl:In+ and KI:Tl+ is investigated. The splitting ratio of the A‐and C‐band under stress is not consistent with predictions of a crystal field model of the defect. This discrepancy is explained by introducing a stress‐dependent axial term of the spin‐orbit coupling which depends on the covalent character of the bond between the defect and its neighbour ions. The strong temperature dependence of the stress effects is a consequence of the anharmonicity of the local elastic constants near the defect.
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