Evidence for a Triplet State of the Self-Trapped Exciton in Alkali-Halide Crystals
- 11 September 1967
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 19 (11), 652-655
- https://doi.org/10.1103/physrevlett.19.652
Abstract
The lifetimes and polarizations of intrinsic recombination radiation from alkali-halide crystals at low temperature are interpreted in terms of two self-trapped exciton states, one predominantly singlet, the other triplet in character. This is the first strong evidence for the triplet assignment. The variation with crystal of the triplet-state lifetime is attributed to effects of the different halogen spin-orbit couplings and the varying degrees of axial relaxation in the self-trapped configuration.Keywords
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