FORMATION AND OPTICAL BLEACHING OF F CENTERS: IMPURITY EFFECTS
Journal Article
·
· J. Phys. Soc. Japan
OSTI ID:4666659
The x-ray darkenability and optical bleaching rate for F centers were measured at room temperature for KCl crystals grown from aqueous solution, and the results compared with crystals of varying purity and method of preparation. The initial rates of formation and bleaching of F centers were lowest for pure KCl grown from solution, highest for melt-grown crystals containing CaCl/sub 2/, and intermediate for Harshaw crystals. Unfiltered x rays were used. As with hard x rays, F-center growth consists of two stages; however, with solution-grown crystals the second stage only develops clearly on re-x-irradiation after bleaching and the first stage follows a rate equation second order in the vacancy concentration. One stage is found sufficient to account for optical bleaching. On re-x-irradiation after bleaching, the same first-stage rate equation is followed. F centers are rapidly formed and the secondary centers are destroyed. The rate depends principally on the concentration of F centers destroyed by the previous bleaching. (auth)
- Research Organization:
- Oregon State Univ., Corvallis
- NSA Number:
- NSA-17-035787
- OSTI ID:
- 4666659
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 18: Suppl. II
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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