Abstract
The nuclear quadrupole resonance shifts of the NMR lines of the nuclei of off-center Li + and Cu + impurity ions in KCl are calculated using perturbation theory and by direct solution of the secular equation. No shifts will be observed if the defect ions are rapidly jumping between equivalent positions in the absence of an applied electric field. Large shifts will obtain if the thermal and tunneling jump rates are low or if an electric field is applied to localize the particle in one of its potential wells. The large difference in the shifts, with the defect ion in various positions in the crystal indicates that quadrupole resonance measurements should be helpful in fixing the magnitude and direction of off-center ions in the alkali halides.
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