Infrared Dispersion in Liquid Benzene and Benzene-d6

Abstract

The intensities of the major infrared absorption bands in liquid C₆H₆ and C₆D₆ were measured by an interferometric method. The intensities of the very intense $a_{\text{2u}}$ modes were found to be 14 450 ± 110 and 8600 ± 110 cm⁻¹ cm²/mM for C₆H₆ and C₆D₆, respectively. Small, but significant deviations from the predictions of the “oriented gas model,” used to interpret these measurements, were observed.