Abstract
Thermally stimulated exoelectron emission (TSEE) in KCl: Tl, KCl: Cu and undoped KCl cleaved in a clean high vacuum and X-rayed at liquid nitrogen temperature, is measured simultaneously with thermoluminescence (TL). On the basis of F-light stimulation experiments and close correlations between TSEE and TL, the main TSEE glow peaks are ascribed to the thermal annihilation of color centers. Among these, the TSEE glow peak at about 210 K in KCl: Tl and KCl: Cu is ascribed to the diffusion of VK centers and the subsequent reaction of these centers with electron-excess centers such as F' centers, while the TSEE glow peak at 207 K in undoped KCl is due to the thermal release of electrons from F' centers. The mechanism of the exoelectron emission due to the annihilation of VK centers may be interpreted in terms of a kind of Auger effect.
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