The FH-Centre Energy Structure in KCl and KBr

Autor: V. N. Salomatov, I. A. Parfianovich
Rok vydání: 1984
Předmět:
Zdroj: physica status solidi (b). 121:401-406
ISSN: 1521-3951
0370-1972
Popis: The energy parameters of the FH(Br−)-, FH(O−) — centres in KCl and FH(O−) — centres in KBr are calculated within the framework of perturbation theory. From the comparison of calculated and experimental data the following conclusions are drawn: (1) the long-wave shift of the F-centre absorption band in KCl with increasing Br− concentration may be due to the formation of FH(Br−)-centres whose components are a apart (a is the shortest interionic distance); (2) the decay of impurity excitons in KCl-Br leads to the creation (or the manifestation in the stimulation spectrum) of the FH(Br−)-centres with components being 2a rather than a apart; (3) the change in the optical characteristics of the FH(O−)-centre as compared to those of the F-centre in KBr is consistent with the experiment assuming that an O− off-centre position in the lattice site exists. The possibility of F-centre RES life-time lowering is mentioned. [Russian Text Ignored]
Databáze: OpenAIRE
Externí odkaz: