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The results of NMR free-induction-decay shape measurements for protons in single crystals and polycrystals of hexagonal ice are reported. The second moments of the corresponding absorption line are derived from empirical fits of the free-induction-decay shapes. Theoretical values for these second moments are computed for several models of the hydrogen lattice, taking into account the effect of vibrations and librations. There is good agreement between the measured and computed second moments, implying that high-frequency proton tunneling is not present.
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Barnaal et al. (1967) studied this question.
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