Abstract
The hexamethylbenzene crystal undergoes a phase transition at 110°K. The near ultraviolet absorption spectra of single oriented crystals of this substance have been studied in polarized light in the neighborhood of the transition temperature. A drastic and discontinuous change of the spectra is observed to accompany the phase change. The spectral change at the transition point is interpreted as indicative of a distortion of the molecule such that only twofold axes remain.
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