VIBRATIONAL SPECTRA OF p-FLUOROCLORO-, BROMO-, AND $IODOBENZENES^{*}$

Abstract

The infrared absorption spectra of liquid p-fluorochloro-,p-fluorobromo- and p-fluorolodobenzene and the stronger bands of the first two compounds in the gaseous state have been obtained in the region 2-38 $\mu$ with the aid of NaCl and CsBr prisms. The Raman spectra of the the compounds in the liquid state have been photographed with a three-prism glass spectrograph of linear dispersion 15A/mm at 4358A, and depolarization ratios have been measured for the stronger Raman bands of p-fluorochloro-and p-fluorobromobenzene. Complete assignments of the fundamental vibration frequencies have made, and the spectra are interpreted in detail.