Abstract
An experimental NMR method is introduced to the study of small Zeeman-torsional transitions, wherein the time evolution of the nuclear polarization is monitored in a tilted rotating reference frame of proton spins. By regulating the orientation and strength of the effective field, the influence of the dipolar interaction on the breadth of the spectral lines can be suppressed. It is not only shown that spectral resolution is considerably improved as the orientation angle approaches Θ M = cos -1( cos -1(1/ 3 ) , but a ‘non-magnetic’, ΔM = 0 transition at the Clough frequency 0 + ω T also becomes observable. The behaviour of tunneling satellites as a function of the tilting angle, as well as the origin of the ΔM = 0 transition line is explored in CH 3CD 2I, methyl malonic and propionic acid.
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