The dominant mechanism of methyl-group rotation in MDBP (4-methyl-2, 6-ditertiary-butylphenol) between 4 and 15 K is a Raman process involving the scattering of optical phonons, rather than the usually assumed two-step process of methyl torsional excitation with phonon absorption and subsequent emission. The Raman process is positively identified for the first time by combining magnetic resonance measurements of tunnel splittings with inelastic neutron scattering spectra for both normal and partially deuterated MDBP.
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Clough et al. (1978) studied this question.
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