$N_{2}$ AND Ar BROADENING OF THE P AND R BRANCHES OF THE $\nu_{3}$ BAND OF METHANE
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Date
1995
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Ohio State University
Abstract
We have recorded ${N_{2}}{-}$ and Ar-broadened spectra of the allowed P-and branch manifolds for $J \leq 10$ in the $\nu_{3}$ band of $CH_{4}$ from the Doppler limit to $\sim 67 kPa at T = 295 K$ using a tunable difference-frequency laser spectrometer. The broadening coefficients and shifts and Dicke narrowing will be compared with prior laser measurements in the Q branch of this $band^{1}$ as well as previous FTIR measurements in the P and R $branches^{2}$. We will also address the question of line mixing between the overlapping tetrahedral components in a given blended J manifold as reported by the NASA Langley $group^{3}$.
Description
1. A.S. Pine, J. Chem. Phys. 97, 773 (1992). 2. D.C. Benner, V.M. Devi, M.A.H. Smith and C.P. Rinsland, JQSRT 50, 65 (1993). 3. D.C. Benner et al., Columbus Symposium, June 1994, paper, ME 12.
Author Institution: National Institute of Standards and Technology, Gaithersburg, MD 20899.
Author Institution: National Institute of Standards and Technology, Gaithersburg, MD 20899.