Abstract
Using the technique of the liquid-core optical fiber (LCOF), we measured the Raman spectra intensities of CCl4 in CS2 at concentrations ranging from 90 to 0.8% in volume. According to the relative peak area ratios and peak height ratios, two kinds of RSCS values of the 459 cm−1 CCl4 band for each concentration, σR A and σR H, were obtained by using Onsager’s model and the internal standard method. The two kinds of RSCS values and their changing tendencies are in agreement with each other. It is also found that both σR A and σR H increase with decreasing solution concentration. When the concentration is higher than 4%, both of them are flat and linear with the volume concentration of CCl4 in CS2. When the concentration is lower than 4%, they increase rapidly with decreasing concentration. At 0.8% both RSCS values increase to ten times that of the 459 cm−1 band of CCl4 in pure liquid. A tentative theory exploration for the experimental results is given, which introduces dispersion forces into Onsager’s model. Additionally, some likely influencing factors on experimental results, such as numerical aperture (NA) of LCOF and baseline subtraction, were researched.
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Yin, JH., Li, ZW., Tian, YJ. et al. A study on Raman scattering cross section of carbon tetrachloride at low concentrations. Appl. Phys. B 80, 573–576 (2005). https://doi.org/10.1007/s00340-005-1756-y
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DOI: https://doi.org/10.1007/s00340-005-1756-y