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LOW-TEMPERATURE OPTICAL BLEACHING OF F CENTERS IN KCl

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
;
Optical bleaching of F centers in x-rayed and additively colored KCl is studied at 77 deg K with pulse irradiation methods. Constant "F light" incident on the colored crystal establishes a photostationary equilibrium between F and F' centers. The application of a high-intensity light flash of appropriate spectrwn displaces the system from equilibrium to either direction. The return to equilibrium is exponential in time, with a rate controlled by the intensity and spectum of the constant light, but not depending on the F-center concentration or the method of coloration. The results are in agreement with a kinetic model involving only F-to-F' center interconversions. Prior room-temperature optical bleaching inhinits the extent and rate of low-temperature bleaching, probably due to the growth of other bands under the F band. The saturation of the extent of bleaching at high pulse-light intensity and a lower bleaching efficiency for the additively colored crystal indicate that the distribution of F centers in the crystal is significant in low-temperature bleaching. (auth)
Research Organization:
Illinois Inst. of Tech., Chicago
NSA Number:
NSA-15-021293
OSTI ID:
4047710
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 122; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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PHOTOEQUILIBRIUM BETWEEN KCl F AND F CENTERS AT 80 K
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Related Subjects

ABSORPTION
BLEACHING
COLOR
CONTROL
CRYSTALS
DEFECTS
DISTRIBUTION
EFFICIENCY
ELECTRONS
F CENTERS
IRRADIATION
LIGHT
LOW TEMPERATURE
MOLECULES
PHYSICS
POTASSIUM CHLORIDES
SPECTRA
SPECTROSCOPY
STABILITY
X RADIATION