OPTICALLY DETECTED E.P.R. OF SELF-TRAPPED EXCITONS IN ALKALI FLUORIDES-LUMINESCENCE IDENTIFICATION

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Abstract
The optical-microwave double resonance of the triplet state of the self-trapped exciton has been detected in alkali fluorides. The luminescence originating from this triplet state (π band) has been identified and the corresponding lifetime measured. The values for the hyperfine interaction parameters are consistent with the model of the Vk having trapped an electron. The contribution of the dipole-dipole interaction to the zero field splitting is dominant. An observed level crossing has shown that the triplet sublevels are not in thermal equilibrium

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