Absolute Infrared Intensities of the CS2 Fundamentals in CCl4 Solution and of the 768–797 cm—1 Fermi Doublet of CCl4 in Cyclohexane Solution

Abstract

The absolute infrared intensities of two nonpolar solute molecules were determined in nonpolar solvents by extrapolating the apparent intensities to zero concentration. For CS₂ the intensities were found to be 5.8×10⁷ cm mole^—1 in CCl₄ in 5.2×10⁷ cm mole^—1 in C₂Cl₄ for the v₃ (1523 cm^—1) mode, and 9.5×10⁵ cm mole^—1 in CCl₄ for the v₂ (395 cm^—1) mode. For CCl₄ the intensity of the 768–797 cm^—1 Fermi doublet was found to be 5.4×10⁷ cm mole^—1 in cyclohexane. The results are discussed in relation to the Polo‐Wilson, Person, and Buckingham expressions for the gas to solution intensity ratio. Modifications of the dielectric expressions were investigated.