Abstract
When hydrogen is diffused into calcium fluoride crystals which contain a rare earth impurity and a relatively low concentration of oxygen two types of RE3+-H- complexes of lower than axial symmetry are formed. These centres have been detected by measurements of the infrared absorption from the localization vibrations of the paired H- (or D-) ions. In crystals containing Ce3+ ions, a new EPR spectrum has been observed which correlates with one of these centres. Models for the centres are discussed, and it is suggested that one may be a simple modification of the trigonal (T2) centre RE3+O2-F7-, where one of the F- ions is replaced by an H- ion.
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