II-Thermally induced changes in the tl of ion implanted CaF2

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Abstract
Thermal treatment of CaF2 has a significant influence on the number and intensity of the peaks seen by thermo-luminescence. A combination of ion implants and anneal cycles leads to the conclusion that the 90°C glow peak is derived from a defect of a substitutional trivalent impurity (e.g. Ce+3) linked to an interstitial fluorine ion. Perturbations of this centre by other defects modify the centre and the glow peak temperature is raised to 110°C. The peaks at 180, 220 and 350°C all involve intrinsic defect clusters. The building of models for the different glow peaks was helped by a comparison of impurity and self ion implantations.