Relative and Absolute Raman Scattering Cross Sections in Liquids

Abstract

Peak and total differential Raman scattering cross sections for several liquids, CH₃OH, C₂H₅OH, i‐C₃H₇OH, (CH₃)₂CO, CH₃CCl₃, CH₃I, c‐C₆H₁₂, and C₆H₅Br, were determined relative to the $v_2{\mathrm{(a}}_{\text{1g}}\text{)=944\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}$ line of C₆D₆ as an internal standard. Using an absolute value for the peak differential cross section of this line and measured values of the radiant intensities and depolarization ratios of selected Raman lines in the above liquids, we have obtained absolute values for ∂σ and ∂σ/∂Ω. Results are expected to be accurate to $\text{± 10 \%}$ unless specified otherwise. Measurements were made using a medium power cw argon ion laser operating at 4880 Å, a double monochromator and a photomultiplier (S‐20 and S‐11) detector.