Optical Studies on Paired Au^- Ions in KCl

概要

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Several new absorption bands are observed in the spectra of single crystals of KCl:Au- irradiated with ultraviolet light at room temperature. Excitation of the crystals with light of these absorption bands at liquid nitrogen temperature causes luminescence having its maxima at 516 nm, 414 nm and 390nm. If the crystals are excited at room temperature only the luminescence with a peak at 520 nm is observed. The new absorption bands, some of which are overlapping the absorption bands of the isolated Au-ions, are attributed to the same center, since irradiation at these bands causes an identical emission of luminescence. From a study of azimuthal dependence of the polarized luminescence, it is found that this center is orientated nearly along <110> directions of the crystals. On the ground of these experimental results, and also by analogy to the case of paired Ag- ion center, the new center is identified with the paired Au- ions orientated along <110> direction.
社団法人日本物理学会の論文
1972-12-05