Infrared Studies of Crystal Benzene. V. Reflection Spectrum and Absolute Intensities

TLDR: In this paper, an experimental procedure for obtaining the reflection spectrum in the infrared from solid benzene is described, and the results are analyzed according to the method of Robinson and Price to give the index of refraction n and the absorption coefficient κ as a function of frequency.

Abstract: An experimental procedure for obtaining the reflection spectrum in the infrared from solid benzene is described. The results are analyzed according to the method of Robinson and Price to give the index of refraction n and the absorption coefficient κ as a function of frequency. Integration of the latter gives the absolute intensity Γi of the ith fundamental, without requiring a knowledge of the path length. Since the path length is the most uncertain variable in the evaluation of absolute intensities from absorption measurements in condensed phases, the intensity results even from these relatively crude reflection measurements are probably as accurate as those from absorption studies. Comparisons are made with other studies on benzene, and the discrepancies are discussed.