Far infrared collision-induced spectrum in gaseous methane. I. Band shape and temperature dependence

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Abstract
The far infrared collision−induced spectrum in CH4 is observed in the region 20−600 cm−1 at temperatures between 163 and 296 K. These results are compared with a synthetic spectrum computed from the theory of Ozier and Fox giving the integrated intensity of the absorption resulting from rotational transitions of the octupole−induced dipole in colliding pairs of molecules. Although such a calculated spectrum accounts for the gross features of the experimental bands, they predict too little absorption in the low and high parts of the band.