Radiation Effects in Halides Photolysis

When AX (e.g., KC1) is irradiated with X-rays (or electrons), pairs of anionic Frenkel defects (Le., Xf, V ) are formed. Most of them recombine, but a small fraction separates and becomes so-called H(X ) and F(Vx) centers. Depending on the tempera- 

Most of the irregular SE s formed by irradiation interact with impurities that are the native irregular SE s of the crystal. Impurities interact with the irradiation products either by their stress field or, if heterovalent, by the electrostatic (Coulomb) field. Photolysis (radiolysis) is found in other than halide crystals as well. In oxides, the production of Frenkel pairs under photon irradiation is negligible. This has been ascribed to the fact that the reaction O2- +0 = 02 is endothermic, whereas the reaction X- +X = is exothermic. 

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