Bleaching Of F-Centers and Formation of Complex Centers In Gamma-Irradiated KCl at Room Temperature
The optical bleaching of F centers in gamma-irradiated KCl was measured. The amount of F centers which bleached quickly, denoted by N, was studied as a function of irradiation dose and bleaching temperature. It was found that N/sub q/ includes the decrease of F center concentration due to complex center formation and due to recombination with positive holes, that the latter part of N/ sub q/ is closely related to the F centers formed in the first stage of gamma- irradiation, and that the complex centers are formed only by the bleaching of F centers formed in the second stage of irradiation. The rate of complex center formation by intermittent light pulses was studied; results indicate that the amount of complex centers formed by a given number of pulses depends on the time interval between successive light pulses. The relaxation time for the formation of complex centers was obtained from these results, and the activation energy (0.95 plus or minus 0.2) ev was obtained. An analysis of the quickly-bleached part of the F center was attempted, taking into consideration that the F centers formed in the first and the second stages of irradiation have different bleaching characteristics and that complex centers are formed after some ionic processes when second-stage F centers are bleached. (auth)
- Research Organization:
- Osaka Univ.
- NSA Number:
- NSA-16-013767
- OSTI ID:
- 4802210
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 17
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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