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

SPIN ORBIT COUPLING

This publication has 14 references indexed in Scilit:

Optical Absorption Spectra of the Alkali Halides at 10°K
Physical Review B, 1967
$V_{K}$ Centers and Recombination Luminescence in Rubidium Iodide and Sodium Iodide
Physical Review B, 1967
Intrinsic Luminescence of RbI and KI at 10°K
Physical Review B, 1966
Radiative lifetime of recombination luminescence in KI
Solid State Communications, 1966
Recombination Luminescence from $V_{K}$ Centers in Potassium Iodide
Physical Review B, 1965
Low-Temperature Recombination Luminescence in Alkali Halide Crystals
Physical Review B, 1964
Theory of the Optical and Magnetic Properties of the Self-Trapped Hole in Lithium Fluoride
Physical Review B, 1964
Spin-Orbit Coupling in Azines
Reviews of Modern Physics, 1963
Absorption Spectra of $F_{2}^{-}$ , ${Cl}_{2}^{-}$ , ${Br}_{2}^{-}$ , and $I_{2}^{-}$ in the Alkali Halides
Physical Review B, 1961
Exciton States in Ionic Crystals
Physical Review B, 1959