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NMR spin-lattice relaxation rates l / T1 have been measured at 15 and 30 MHz and various temperatures in polycristalline sodium and potassium acetate. The results for CH3COONa are characteristic of methyl group tunnelling with a frequency which is very much larger than the NMR Larmor frequency. Derived values of the torsion energy (1.1 kJ/mol) and the ground state tunnel splitting (5.6 meV) agree with data obtained from inelastic neutron scattering by Clough et al. The shape of the hinderingdoi:10.1515/zna-1985-0610 fatcat:3zciu7kbnfgd7k3x5hwyn7gvvu