Growth and Bleaching of the Z1 Band in KCl Doped with Divalent Impurities

✍ Scribed by R. Cappelletti; L. Dalla Croce; R. Fieschi

• Publisher: John Wiley and Sons
• Year: 1963
• Tongue: English
• Weight: 508 KB
• Volume: 3
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.19630030806

✦ Synopsis

Abstract

The rate of F and Z~1~ center formation by X‐irradiation is studied at different temperatures in doped KCl crystals; at 0°C and at room temperature the slow but fully reproducible, growth of a Z~1~ band is found, but this attains only a low saturation value. The results can be interpreted by assuming that the X‐rays have an additional bleaching effect which is stronger for the Z~1~ than the F centers. The effects of free holes in the valence band (obtained by optical stimulation of V centres) on these centers is also studied at different temperatures, and the ratio of the capture cross sections for holes, σ/σ is determined, the values ranging from 2.1 (at liquid nitrogen temperature) to 1.5 (at room temperature).