Infrared Spectra in Polarized Light of Crystalline Benzene and Benzene-d6

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Abstract
The high‐resolution spectra in polarized light of oriented polycrystalline films of C6H6 and C6D6 at 85°K have been obtained. The observation of two different crystal faces allowed the classification of the Davydov components, according to their polarization character, into three different sets, which correspond to the three infrared‐active factor‐group symmetry species. The complications which arise from the presence of isotopic impurities (13C12C5H6 in 12C6H6, 13C12C5D6 and 12C6D5H in 12C6D6) are removed thanks to the use of polarized light, the aid of the correlation between C6H6 and C6D6 spectra, and solid solution information. Therefore, a complete assignment of all the observed peaks has been possible. The experimental results have been compared with exciton splittings and crystal shifts calculated by other authors.