Abstract
AbstractUsing the liquid‐core optical fiber technique, we measured the Raman spectral intensities of CCl4 in CS2 at concentrations ranging from 90 to 0.05% (v/v). Raman scattering cross‐sections (RSCSs) of the 459, 314 and 218 cm−1 CCl4 bands were calculated using Onsager's theory with the 656 cm−1 Raman band of CS2 as an internal standard. The results show that the RSCSs of the three CCl4 bands increase with decreasing concentration of CCl4 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 CCl4 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. Copyright © 2004 John Wiley & Sons, Ltd.
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