On the R Centers in Lithium Fluoride
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概要
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In colored LiF crystals, two bands at 320 and 378 mμ have been investigated and assigned as R_1 and R_2 bands the correspondences to R bands in other alkali halides. Intensity ratio of the R1 band to the R_2 band is almost constant irrespective of irradiation conditions of or γ-rays as well as of photochemical treatments. Both the bands are bleached irradiation with either R_1 or R_2 light, where the former has a higher efficiency for the bleaching. The results support the interpretation that R_1 and R_2 bands are due to transitions in the same center. Emission spectra excitation with R1 and R2 lights are distinct: the latter has a peak at 495 mμ and the former at 730 mμ or above. By polarized R lights, dichroism is induced in the R_1, R_2 and M bands and also polarization of the emissions is observed. Then symmetries of the models which have been -proposed as complexes of F centers are examined the experimental results and it is considered that F_3-model lying in [111] plane is the most adequate for R center. In addition to characteristic M-center luminescence, which has a peak at 710 mμ and value of 0.6 for P [011], an emission band at 525 mμ is observed M-light excitation but P-factor for this emission is less than that of the M-center luminescence.
- 一般社団法人日本物理学会の論文
- 1961-09-05
著者
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Okuda A.
Department of Agricultural Chemistry, University of Kyoto
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Okuda A.
Department of Mathematics and Physics, Ritsumeikan University
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- On the R Centers in Lithium Fluoride