# NITROGEN-BROADENING OF THE INFRARED LINES OF $^{12}CH_{4}, ^{13}CH_{4}$ AND $^{12}CH_{3}D$ AT LOW TEMPERATURES

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 Title: NITROGEN-BROADENING OF THE INFRARED LINES OF $^{12}CH_{4}, ^{13}CH_{4}$ AND $^{12}CH_{3}D$ AT LOW TEMPERATURES Creators: Varanasi, P.; Giver, L. P.; Valero, Francisco P. J. Issue Date: 1983 Abstract: From high-resolution ($0.06 cm^{-1}$) measurements of spectral transmittance at 100 K, 153 K, 200 K and 296 K in the $\nu_{3}$ and $\nu_{4}$ bands of $^{12}CH_{4}$ and $^{13}CH_{4}$, and in the $\nu_{2}$ and $\nu_{6}$ bands of $^{12}CH_{3}D$, we have determined accurate nitrogen-broadened line widths and their dependence upon temperatures. While the simple $T^{-1.0}$ dependence prevails in all the cases, the line-widths of $CH_{3}D$ are larger than those of $CH_{4}$, for the same rotational quantum-numeral designations, by nearly fifty percent. The theoretical implications will be discussed. $^{*}$Supported by the Planetary Atmospheres Branch of the Earth and Planetary Exploration Division of NASA under Grant No. NGR 33-015-139 URI: http://hdl.handle.net/1811/11980 Other Identifiers: 1983-TE-09