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- W1979059932 abstract "The NMR spectra of the protons in some methyl groups show temperature dependences at low temperatures where hindered rotation is thought to be ineffective. A theory based on the density matrix formalism is presented here for this effect. A rotational barrier having three-fold symmetry is assumed, and an equivalent spin Hamiltonian is assigned to each torsional level for the methyl group. Thermally activated transitions between the torsional levels cause the spin system to experience a fluctuating Hamiltonian. It is shown that in the limit of large rates of transition between the torsional levels, the NMR spectrum is determined by the time average Hamiltonian. The important parameter turns out to be the average of the tunnelling splitting over the thermally populated torsional levels." @default.
- W1979059932 created "2016-06-24" @default.
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- W1979059932 date "1976-07-28" @default.
- W1979059932 modified "2023-10-18" @default.
- W1979059932 title "Theory of the temperature dependence of the NMR spectra of tunnelling methyl groups" @default.
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- W1979059932 doi "https://doi.org/10.1088/0022-3719/9/14/016" @default.
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