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).