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The F H ‐Centre Energy Structure in KCl and KBr
Author(s) -
Salomatov V. N.,
Parfianovich I. A.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221210142
Subject(s) - impurity , exciton , lattice (music) , chemistry , physics , atomic physics , analytical chemistry (journal) , crystallography , condensed matter physics , quantum mechanics , chromatography , acoustics
The energy parameters of the F H (Br − )‐, F H (O − ) — centres in KCl and F H (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 F H (Br − )‐centres whose components are a \documentclass{article}\pagestyle{empty}\begin{document}$ a\sqrt 2 $\end{document} apart ( a is the shortest interionic distance); (2) the decay of impurity excitons in KCl‐Br leads to the creation (or the manifestation in the stimulation spectrum) of the F H (Br − )‐centres with components being 2 a rather than a \documentclass{article}\pagestyle{empty}\begin{document}$ a\sqrt 2 $\end{document} apart; (3) the change in the optical characteristics of the F H (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.