Weak, broad, Raman bands have been observed from water and heavy water at shifts above and below those corresponding to the intramolecular bending and stretching vibrations. Bands near Δv̄ = 1190 cm−1 for D2O and Δv̄ = 1625 cm−1 for H2O, in addition to relatively sharp bands at 1210 cm−1 for D2O and 1640 cm−1 for H2O are thought to arise from intramolecular bending vibrations of D2O and H2O molecules that are either partially, or fully hydrogen bonded. Other weak bands can be explained as combinations of known intra- and intermolecular vibrations, in particular, librations.

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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.

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