Color-Center Kinetics in Cerium-Containing Glass

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Abstract
The formation and thermal bleaching of radiation‐produced color centers in cerium‐containing soda—silica glass are studied to determine the effect of cerium on color‐center kinetics. The optical absorption changes occurring during and after irradiation with gamma and x rays are measured. The data are fit by equations obtained by integrating a set of reaction‐rate equations. These equations are an approximate description of the following three processes that account qualitatively for the effects of cerium concentration and oxidation state: Ce3+ ions, by capturing radiation‐produced holes to form Ce3+ + centers, inhibit formation of all other kinds of centers due to trapped holes; Ce4+ ions, by capturing electrons to form (Ce4+ + electron) centers, inhibit formation of all other kinds of centers due to trapped electrons and inhibit recombination of electrons with trapped holes; after cessation of irradiation, holes are transferred from their traps to Ce3+ ions.

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