Low-Frequency Raman Lines from Liquid Benzene, Benzene Derivatives, and Other Organic Liquids

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Abstract
Recently it has been possible to study some heretofore unobserved low‐frequency Raman lines from liquids. This study is concerned with some of these low‐frequency lines which occur mainly in the 30‐ to 85‐cm−1 region. The effects on these lines of temperature variations, different solvents, deuterium, and other substitutions, and dissolved salts are given. The depolarization ratios of the low‐frequency line from benzene and toluene (also carbon tetrachloride) are given. Approximate half‐widths and intensities relative to the benzene 75‐cm−1 line are given. Some other newly observed low‐frequency Raman lines are reported, including those from liquid and solid polystyrene. Evidence from this work indicates these low‐frequency Raman lines probably arise from intermolecular vibrations in liquids. The results can be interpreted on the basis of a somewhat disordered solid (quasicrystalline) structure for liquid benzene, and for some other liquids.