Accession Number : AD0672692

Title :   PHOTOCHEMICAL CONVERSION OF COLOR CENTERS IN HEATED CRYSTALS OF POTASSIUM CHLORIDE (O FOTOKHIMICHESKOM PREVRASHCHENII KRASYASHCHIKH TSENTROV V NAGRETYKH KRISTALLAKH KHLORISTOGO KALIYA),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Shatalov,A. A.

Report Date : 19 OCT 1967

Pagination or Media Count : 16

Abstract : Exposition of the results of an investigation into the photochemical conversion of F-centers in KCl crystals at temperatures 270-300C, which leads to the complete disappearance of the F-band of absorption and to its substitution by a very similar new symmetric bell-shaped band (X-band) displaced about 0.5 ev toward the long-wavelength side. For lower temperatures (250-150C) the light action also leads to complete disruption of the F-band with its substitution by wider and lower symmetrical bands of absorption displaced somewhat still more toward the side of long wavelengths. The temperature dependence of the absorption X-band is characterized by its enhancement, contraction, and insignificant displacement toward the short-wavelength side during cooling. The author presents preliminary results of the measurement of the kinetics governing the process of photochemical conversion of F-centers for various temperatures, and expresses an assumption concerning the connection between observed thermophotochemical conversions of F-centers and the process of formation of colloids of the alkali metal. He states the possible mechanism governing the conversion of F-centers into F2-centers under the action of light. (Author)

Descriptors :   (*CRYSTALLOGRAPHY, POTASSIUM COMPOUNDS), CRYSTAL LATTICES, PHOTOCHEMICAL REACTIONS, X RAY ABSORPTION ANALYSIS, USSR

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE