Abstract
The Raman spectrum of liquid carbon disulphide has been investigated with high dispersion. In addition to the lines already known, five very faint lines have been observed. The intensities of the stronger lines were measured and, with a spectrograph of low dispersion, the degrees of depolarization of the two principal bands were determined. The results are in accord with the assumption made by Fermi, Dennison and Placzek that large perturbations of some of the energy levels occur on account of the approximate coincidence of v1 with 2v2. The values Δ = —120 cm—1 and |P| = 17.8 cm—1 are obtained for the difference Δ = v1 — 2v2 and for the coupling constant P = βh½/4π2μ1½μ 2(v1+2v2)32.
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