OPTICAL ABSORPTION AND ELECTRON SPIN RESONANCE AFTER OPTICAL AND THERMAL BLEACHING OF F CENTERS
A correlation is observed between changes in the halfwidth and peak position of the F band and the presence of M and R centers in x-irradiated KCl crystals. The changes in the shape of the F band caused by optical bleaching are atirdbuted to absorption bands of M and R centers located in the spectral region of the F band. The narrowing of the electron spin resonance line which occurs during optical bleaching of x-irradiated KCl crystals is removed by thermal treatment at 140 deg C. The narrowing is tentatively attributed to the presence of a second, narrow resonance line, due to either R/sub 3/ or N centers, which is superimposed on the line attributed to F centers. The results also suggest that M, R, and V/sub 3/ centers are not paramagnetic. Both the optical absorption and the electron spin resonance measurements indicate that F centers are present even after prolonged optical bleaching and that the character of the F center is not ehanged during bleaching. (auth)
- Research Organization:
- IBM Research Center, Yorktown Heights, N.Y.
- NSA Number:
- NSA-16-009320
- OSTI ID:
- 4814044
- 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- Physical Review (U.S.) Superseded in part by Phys.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, Vol. Vol: 125; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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