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Using the liquid-core optical fiber technique, we measured the Raman spectral intensities of CCl 4 in CS 2 at concentrations ranging from 90 to 0.05% (v/v). Raman scattering cross-sections (RSCSs) of the 459, 314 and 218 cm −1 CCl 4 bands were calculated using Onsager's theory with the 656 cm −1 Raman band of CS 2 as an internal standard. The results show that the RSCSs of the three CCl 4 bands increase with decreasing concentration of CCl 4 over the whole range measured. It was unexpected that the RSCSs show different changes in various ranges, that is, a flat linear change at higher concentrations and a strong change at lower concentrations. With decrease in CCl 4 concentration from 90 to 0.05% (0.1% for the 314 cm −1 band), the RSCSs of the 459 and 314 cm −1 bands show large increases. The RSCS of the 218 cm −1 band shows a relatively small change in the measured range.

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