Fig. 4.

Complementary vibrational spectra of organic molecules. a benzene, b chloroform, c 4:1 mixture of benzene and DMSO. Red and blue curves represent CVS-IR and CVS-Raman spectra, respectively. The inset shows the zoomed spectrum of the Raman peaks of DMSO and benzene around 3000 cm⁻¹. The vibrational lines are found from 800 to 1700 cm⁻¹ in the CVS-IR spectrum and from 600 to 3100 cm⁻¹ in the CVS-Raman spectrum. The small spikes at 500–550, 750, 1250, and 2500 cm⁻¹ in the CVS-Raman spectra are attributed to instrumental noise, which can be removed by careful instrumentation