Raman Difference Spectroscopy with the Rotating Cell

Abstract

A simple technique is described which makes it possible to record Raman difference spectra of binary liquid systems. The main feature is a divided rotating Raman cell for liquids and a gated electronic system. The cancellation of solvent lines in the Raman spectrum of a solution is demonstrated on a 1:1 mixture of CCl4 and CHCl3 and on an MnO4−-H2O solution. Further advantages of this technique are accurate wavenumber shift measurements (e.g., the isotopic lines of ν1 in CHCl3) and correction of the intensity error of Raman lines obtained from highly absorbing solutions (e.g., I2-CHCl3).