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F-and M-BAND ABSORPTION IN HEAVILY GAMMA-IRRADIATED 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Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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
;
Measurements of F- and M-band absorptton at room temperature as a function of gamma irradiation are used to stady the relation between F centers and M centers in a number of KCl crystals from a variety of sources. Although the F-center coloring curves exhibit a variety of forms, presumably due to differert trace impurities and imperfectiona in the crystals, the M-center density seems in all cases to be nearly proportional to the square of the f- center concentration. The ratio of the M-center concentration to the square of the F-center concentration appears to be related to trace impurity content. Zone refining decreases the relative M-center introduction, as does deliberate doping with calcium; whereas, plastic deformation has no effect on the ratio. Bleaching increases the Mcenter concentration at the expense of F centers; however, short re-irradiation with gamma rays causes the ratio of M-certer concentration to the square of F-center concentration to return to its prebleaching value. The results are thought to indicate that a radiation equilibrium exists between F and M centers which is frozen in when the crystals are removed from the source. (auth)
Research Organization:
Oak Ridge National Lab., Tenn.
NSA Number:
NSA-17-000592
OSTI ID:
4781197
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 128; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ABSORPTION
BLEACHING
CALCIUM
COLOR
COLOR CENTERS
CRYSTALS
DEFECTS
DEFORMATION
GAMMA RADIATION
IMPURITIES
IRRADIATION
LATTICES
LIGHT
METALS, CERAMICS, AND OTHER MATERIALS
POTASSIUM CHLORIDES
RADIATION EFFECTS
REFINING
STABILITY
VACANCIES
ZONES