Local cathodoluminescence analysis was used to identify defects in indented crystals. It was found that the combined density of all sorts of F center-like defects attained its maximum in the dislocation zone around the indentation crater. Subsequent annealing led to the annihilation of the defects in this zone. However, in the indentation crater zone, the partial density of Fs (and especially F2) predominated over F2+. The partial density of F2 centers was increased by X-irradiation, and was decreased by annealing. However, only the partial density of Fs predominated after annealing.

T.A.Nazarova, M.V.Nazarov: Radiation Effects and Defects in Solids, 1995, 134, 307-9