Optical detection of spin relaxation processes in the triplet state of the self trapped exciton in alkali halides

Abstract

The transient response of the triplet self-trapped exciton luminescence intensity to a pulsed microwave excitation was measured for 1.3 K < T < 4.2 K in NaCl, KCl, RbCl, KBr, RbBr and CsBr. The results are quantitatively explained with a theoretical model describing the spin relaxation phenomena as 1-phonon direct processes. Good agreement was obtained as a function of temperature and magnetic field.