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The energy level splitting due to tunnelling motion of the methyl groups in sodium acetate trihydrate, Na(CH 3 COO)3H 2 O, has been measured by inelastic neutron scattering at 4K for hydrostatic pressures up to 5 kbar. The splitting falls from 5.7 mu eV at atmospheric pressure to 2.2 mu eV at 5 kbar with an exponential pressure dependence indicating a linear dependence of the height of the hindering potential on pressure.
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Clough et al. (1979) studied this question.
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