Effect of Plastic Deformation on the ProductionFCenters,MCenters, andVCenters in KCl

Abstract

The effect of plastic deformation and heat treatment on the room temperature production of $F$ centers, $M$ centers, and $V$ centers by ${\mathrm{Co}}^{60}$ gamma rays was investigated. Deformation of an irradiated sample caused a reappearance of the "first stage" coloration for $F$ centers when the sample was irradiated further. This deformation induced enhancement of the colorability could be annealed out by heat treating the samples in air at 450°C for 20 min. It was also observed that the coloration curves for the $V_2$ band were very similar to those for the $F$ band, and that they were affected by deformation, heat treatment, and optical bleaching in the same way.