Far-infrared absorption spectrum of the CH 4-H 2 gaseous mixture

Abstract

The rototranslational absorption spectrum of the CH 4-H 2 gaseous mixture has been measured at five different temperatures from 296 to 140 K, in the frequency range 150–850 cm -1. The absorption spectra due to the CH 4-H 2 interactions have been analyzed considering only the quadrupolar induction of H 2 on CH 4 and the octupolar and hexadecapolar inductions of CH 4 on H 2. Under this assumption, the experimental data have been well accounted for, thereby providing a reliable way of predicting the CH 4-H 2 spectrum in a wide temperature range.