Abstract
The structure of a new electron-deficient color center ( V-center) in LiF has been determined from its paramagnetic-resonance hyperfine spectrum. The electron deficiency is localized on three fluoride ions which form an obtuse isosceles triangle lying in a (001) plane with the height along a [110] direction. The orbital of the unpaired electron is primarily determined by the crystalline field and is of the π-type, in contrast to previously discussed V-centers. There is evidence that the electron deficiency is associated with an aggregate of three vacancies, so that the charge is compensated.
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