On the N Centers in KCl Crystals

概要

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The optical and thermal natures of N (N_1 and N_2) centers in additively colored KCl crystals were investigated. These centers were optically stable, but thermally sensitive. Their thermal stabilities were contrasting, N_1 center being far more stable than N_1 center. They were found to have intimate relations with R center. The investigations of photochemical and thermochemical reactions revealed that N_1 centers were grown as R centers decayed thermally, and conversely the latters were grown by bleaching of the formers with the illumination of N_1 band. Two absorption bands which were intimately connected to N_1 center were observed in R bands region, forming the colloidal bands. Also, one band at the higher energy side of F band was found to be closely related with N_1 center. The natures of N_2 center showed striking resemblances with those of R center. M center, on the other hand, had little relations with N centers, at least directly. Pick's models of N centers were discussed in the light of the above experimental results.
社団法人日本物理学会の論文
1962-09-05