Experiments are reported in which a controllable torque is exerted via nuclear dipole-dipole interactions on hindered methyl groups in crystals at low temperatures, resulting in coherent rotation resisted by molecular friction. The spectroscopic method reveals the lifting of a degeneracy through the breaking of time-reversal symmetry as a result of the frinction. It is connected with the berry quantum mechanical phase law.
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Clough et al. (1988) studied this question.
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