Abstract
The marked enhancement of the rate of formation of F centers in alkali halides containing alkaline earth impurities is well recognized. A mechanism is described which employs the isolated cation vacancy and satisfies the experimental requirements of small energy absorption and small volume change per F center. A description is given of the decomposition products of the center. Results from optical density measurements suggest that the proposed mechanism for the enhancement of F-center production in alkali halides is reasonable. The primary step is hole capture at a cation vacancy. The subsequent rearrangement creates an anion vacancy and a halogen atom in the cation site. Illustrations are included which show photon energies as a function of optical density and the change in optical density. (B.O.G.)
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