Near Ultraviolet Spectrum of Crystalline Hexachlorobenzene

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Abstract
The spectrum of single crystals of hexachlorobenzene in polarized light was investigated at liquid nitrogen and liquid helium temperatures, in the 3000 A region. The absorption spectrum consists of a forbidden benzene‐type molecular spectrum with transition moment in the molecular plane and an allowed spectrum based on the 0–0 band which is polarized in a direction close to the molecular normals. This spectrum is concluded to be crystal induced. A prominent band at 790 cm—1 from the 0–0 band is assigned as involving the a2g vibrational fundamental and its observation in the b‐axis polarized component suggests that the molecule is puckered and has symmetry D3d in the crystal.

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