The vibrational spectra of liquid aromatic hydrocarbons – bromobenzene, dioxane, toluene – are studied in a wide frequency range by means of Raman spectroscopy. The manifestation of torsional vibrations of individual groups of atoms is established from the obtained data on the low-frequency spectra. The possibility of using a semiempirical method for calculating the potential barriers of methyl and halide groups in benzene derivatives is shown.

This work is a logical continuation of our studies [1, 2] and devoted to studying the dependence of molecular interactions of toluene and aniline within the wide range of frequencies. As a result of the statistical treatment of the far parts of the depolarized component spectrum of molecular scattering, it has been shown that the best approximation corresponds to a Gaussian. K e y w o r d s: orientation spectroscopy, molecular scattering of light, orientational motion of molecules in liquids, anisotropic molecules, relaxation mechanism, relaxation time, fluctuation.

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The temperature curve of the contour shape of the depolarized part of molecular scattering of light has been measured in liquid bromine benzene. It has been shown that the regularities observed in the scattering can be interpreted with a mechanism of retarded rotation of liquid molecules with regard for the specificity of the intermolecular interaction in bromine benzene.