Far Infrared Absorption Spectra in Gaseous Methane from 138 to 296 K
The rototranslational collision-induced absorption spectrum of gaseous CH4 has been measured from 40 to 600 cm-l at five different temperatures, from 138 to 296 K. Assuming that octopolar and hexa-decapolar induction mechanisms contribute to the absorption, we have derived the octopole and hexadecapole electric multipoles from the analysis of the spectral moments α and γ. We discuss the differences between our values and previous ones and we give an easy temperature interpolation of the moments of the collision-induced rototranslational methane spectra.
KeywordsMethane Microwave Anisotropy Hexa Tral
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