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The ³T_1μ and ³A_1μ adiabatic potential energy surfaces of T1⁺-type impurities in alkali halides have been computed taking into account the spin-orbit interaction and the linear and quadratic Jahn-Teller interactions with Eg vibrational modes. Effects of T2g modes are assumed to be negligible. The inclusion of the quadratic effect leads to tetragonal nondegenerate T minima with underlying trap levels, besides X minima and their trap level already predicted for the linear Jahn-Teller effect. This level scheme is required in order to explain many experimental features concerning AT and AX emissions.
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Ranfagni et al. (1974) studied this question.
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