Photochemically produced color centers in KCl and KBr. Technical report No. 5
Technical Report
·
OSTI ID:6314954
KCl and KBr crystals were exposed to unfiltered quartz mercury arc radiation at 15/sup 0/K. If an OH band was present in the crystals before irradiation, the ultraviolet irradiation produced an optical absorption spectrum similar to that produced by x rays at 15/sup 0/K. The optical absorption spectrum and the changes in the absorption produced by annealing at higher temperatures were measured and compared with the spectra observed during similar annealing of x-irradiated crystals. In KCl the 335 m..mu.. band formed by the uv-irradiation bleaches thermally at 56/sup 0/K as does the 335 m..mu.. H band of x-irradiated KCl. The V/sub 1/ band appears at 56/sup 0/K with the disappearance of the H band. As in the case of x-irradiated KCl, the H band may be partially restored by illuminating the crystal with light absorbed in the region of the V/sub 1/ band. In KBr the 381 m..mu.. band bleaches in steps at 35/sup 0/, 46/sup 0/, 56/sup 0/, and 80/sup 0/K as compared with the 381 m..mu.. H band in x-irradiated KBr which bleaches at 30/sup 0/, 46/sup 0/, 56/sup 0/, and 80/sup 0/K. The V/sub 1/ band appears at 46/sup 0/K and grows at 56/sup 0/K. Illumination in the V/sub 1/ band causes regeneration of the H band as occurs in x-irradiated KBr. In both KCl and KBr the photoproduced H band grows by about 10% at approximately 25/sup 0/K. It is concluded that the H centers bleach thermally by diffusing to and combining with other color centers. Recombination with F and ..cap alpha.. centers annihilates the H centers and leads to the formation of V/sub K/ centers, while recombination with a third center (possibly a positive ion vacancy) results in the formation of V/sub 1/ centers.
- Research Organization:
- Illinois Univ., Urbana (USA). Dept. of Physics
- OSTI ID:
- 6314954
- Report Number(s):
- NP-5900331; ON: DE85900331
- Country of Publication:
- United States
- Language:
- English
Similar Records
PHOTOCHEMICALLY PRODUCED COLOR CENTERS IN KCl AND KBr
PHYSICS OF THE SOLID STATE. Technical Report No. 2
COLOR CENTERS PRODUCED IN KCl AND KBr BY PROLONGED X-IRRADIATIONS AT LOW TEMPERATURES
Journal Article
·
Fri Mar 31 23:00:00 EST 1961
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
·
OSTI ID:4031968
PHYSICS OF THE SOLID STATE. Technical Report No. 2
Technical Report
·
Sat Oct 31 23:00:00 EST 1959
·
OSTI ID:4210164
COLOR CENTERS PRODUCED IN KCl AND KBr BY PROLONGED X-IRRADIATIONS AT LOW TEMPERATURES
Thesis/Dissertation
·
Mon Dec 31 23:00:00 EST 1962
·
OSTI ID:4013992
Related Subjects
36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
ABSORPTION SPECTRA
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
F CENTERS
H CENTERS
HALIDES
HALOGEN COMPOUNDS
POINT DEFECTS
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
RADIATIONS
SPECTRA
ULTRAVIOLET RADIATION
VACANCIES
VISIBLE RADIATION
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
ABSORPTION SPECTRA
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
F CENTERS
H CENTERS
HALIDES
HALOGEN COMPOUNDS
POINT DEFECTS
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
RADIATIONS
SPECTRA
ULTRAVIOLET RADIATION
VACANCIES
VISIBLE RADIATION