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Pairs of F‐Centres and F − Impurities in KCl Studied by ENDOR
Author(s) -
Söthe H.,
Studzinski P.,
Spaeth J.M.
Publication year - 1985
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.2221300135
Subject(s) - impurity , ion , vacancy defect , atomic physics , halogen , resonance (particle physics) , chemistry , doping , crystallography , physics , condensed matter physics , alkyl , organic chemistry
By optical bleaching of F‐centres in KCl doped with KF at −60 °C about half of the F‐centres can be converted into room temperature stable pairs of F‐centres and F − impurity ions, which have a single optical absorption band peaking at a 5% lower energy than the F‐centre. With electron nuclear double resonance (ENDOR) could be shown that the F − impurity resides in a [200] next‐nearest position and not in a [110] nearest halogen position. The K + ion between the anion vacancy and the F − ion is displaced by ≈ 11% towards F − . Its superhyperfine constants show a strong temperature dependence.
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