ABSTRACT
Photosensitive glasses that produce color upon ultraviolet irradiation followed by thermal treatment have been known for many years. In the case of solarization, the trapped species are the source of the induced absorption while in the photosensitive glass the trapped electrons and holes play an intermediate role leading to the induced absorption. Photosensitive Glass and Glass-Ceramics discusses photochromic glass. In the latter case, it has more relevance in that it deals with the photolysis of the Ag halide nanocrystals. Nonetheless, one might expect that formation of Ag nanoparticles in glass by a photolytic process might have something in common with the formation of the Ag-particle in photographic emulsion. Photosensitive Glasses they are parity-forbidden to the first order. However, there are also charge transfer transitions where the electron is transferred to the oxygen ion ligand that is bonded to the metal ion.
