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New Color Centers in KCl Crystals

✍ Scribed by G. Matsumura; G. C. Kuczynski

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
355 KB
Volume
55
Category
Article
ISSN
0370-1972

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✦ Synopsis

Abstract

New absorption centers giving bands with maxima at 555 nm (Y) and 625 nm (Yβ€²) at liquid‐nitrogen temperature, were observed in OH–containing KCl single crystals annealed in vacuum a t 600 Β°C and subsequently uv irradiated. The thermal bleaching of these bands yields F centers. Optical bleaching of Yβ€² yields increase of intensity of Y and F bands and vice versa. The Y and Yβ€² centers can be converted into F centers by compressing the crystal. This reaction is accompanied by emission of 460 nm light. Study of the effect of ambient atmospheres upon formation of these centers suggests the involvement of oxygen molecule ions present in the crystals.

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## Abstract New luminescence bands are observed in KCl containing F and F‐aggregate centers under strong excitation with an infrared laser. All these emission bands occur at energies higher than those of the pumping beam. These β€žup‐conversion”︁ emissions are assigned to transitions from higher exci