Optical Absorption of Self-Trapped Holes in AgCl and AgBr

✍ Scribed by W. Ulrici

• Publisher: John Wiley and Sons
• Year: 1970
• Tongue: English
• Weight: 401 KB
• Volume: 40
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.19700400214

✦ Synopsis

Abstract

In AgCl crystals doped with V^3+^, Cr^3+^, Fe^3+^, Ni^2+^, Cu^2+^, and chalcogen an infrared absorption at 9200 cm^−1^ is measured after irradiation at 20 °K. By comparison with ESR measurements on these crystals the infrared absorption can be assigned to holes trapped at lattice cations (Ag^2+^). The localization of the holes at lattice cations is explained by the valence band structure of silver halides and a Jahn‐Teller effect of the 4d^9^ configuration. AgBr crystals doped with V^3+^ or Cr^3+^ show after irradiation at 20 °K an infrared absorption at 7100 cm^−1^ with analogous properties as in AgCl.