ABSTRACT
The photochemical products of the F-center in colored alkali halides, e.g., F− and F+-centers, play an important role on the photoplastic effect(PPE) as well as photoplastic aftereffect(PPAE) at around room temperature. A comprehensive theory based on statistical dislocation dynamics is proposed to account for PPE and PPAE in alkali halides containing the F-centers. Through PPE and PPAE experiments together with the theoretical relation, the lifetime of the F−-center in colored KCl at RT was evaluated to be about 2 sec and relevant activation energy was 0.29 eV in the temperature range from 200 K up to RT.
