Abstract
We report here a simple and direct observation that the molecular long axis is not, on the average, a rotation axis for the entire molecule in the smectic $C$ phase (rotational freeze-out). This observation is made in the compound 4-$n$-heptyl-${d}_{15}$-oxybenzoic acid-${d}_{1}$ where experiment clearly shows that the principal axes of the time-averaged deuterium quadrupole interactions at specific sites of the hydrocarbon chain are not all parallel, demonstrating that they do not share a common axis of rotation.
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