LIFETIME OF TRIPLET M CENTER IN ALKALI HALIDE CRYSTALS

The decay of the lowest triplet state of the M center is considered on the basis of the McCall-Grossweiner model, which consists of a superposition of radiative and non-radiative processes. The radiative decay is postulated to occur with the help of the spin-orbit interaction; the sensitivity of the lifetime to the energy difference between the lowest triplet and lowest singlet state is pointed out. Further calculations and experiments are suggested. © 1968.