Abstract
Zero-field NMR spectra of tunnelling methyl group, classically reorienting methyl group and of a pair of spins 1/2 jumping between two perpendicular orientations are calculated. A formula for the second moment of a rigid lattice is derived from a formal analogy between zero-field and high-field spectra. Fast reorientation about a perpendicular axis reduces the intramolecular second moment to 1/4 of its rigid value. The zerofield method seems to be a promising tool for the determination of tunnelling splitting or of jumping rates.
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Hennel, J.W., Birczyński, A., Sagnowski, S.F. et al. Theory of zero-field NMR spectra. Effects of motion. Z. Physik B - Condensed Matter 60, 49–55 (1985). https://doi.org/10.1007/BF01312642
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DOI: https://doi.org/10.1007/BF01312642