Photobleachable electron-beam-induced coloration has been observed in certain photochromic materials. This behavior is explained in the case of CaTiO₃: Fe-Mo by the trapping of electrons and holes at Mo⁶⁺ and Fe³⁺ ions, respectively, producing the colored state of the material. The material is restored to its uncolored state by the photo-induced transfer of an electron from Mo⁵⁺ to Fe⁴⁺.
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Kiss et al. (1969) studied this question.
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