The collision-induced far-infrared absorption band of gaseous methane in the region 30–900 cm −1

Abstract

The collision-induced rotational band Of CH 4 has been measured at 195 K from ≈30 to 900 cm −1. These results have been analyzed with a quantum-mechanical lineshape which shows that this spectrum can be understood on the basis of octupole- and hexadecapole-induced dipoles. However, this analysis has revealed the role of bound and predissociating dimers in the spectrum.