ANALYSIS OF THE $2\nu_{3}$ BAND OF $CF_{4}$ ($2540-2600 cm^{-1}$)
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Date
1994
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Publisher
Ohio State University
Abstract
An analysis of the $F_{2}$ and E vibrational components of the $2\nu_{3}$ band of $CF_{4}$ in the infrared between 2540 and $26000 cm^{-1}$ will be presented. A nearly Doppler-limited spectrum was recorded using difference-frequency laser with the $CF_{4}$ sample contained in a white cell cooled to $T=77 K (p=8 Pa, L=8)$ to reduce spectral congestion. An analysis was performed using an isolated band model to sixth order in the tetrahedral formalism. The $2\nu_{3}$ assignments were initiated using predictions from a vibrational extrapolation $method^{1}$ based on constants of the $\nu_{3}$ $band^{2}$ and anharmonic force field $calculations^{3}$ of the $2\nu_{3} \ A_{1}+E+F_{2}$ sublevel centers. Only 22 free parameters were adjusted (the $\nu_{3}$ parameters were held fixed analysis). 1475 transitions were assigned through $J=35$, of which 1005 were fit with a standard deviation of $0.0021 cm^{-1}$ which is considerably largest than the measurement precision estimated to be $=0.0001 cm^{-1}$. Some of the discrepancies can be clearly attributed to interactions with the $\nu_{3}+2\nu_{4}$ and $4\nu_{4}$ bands as expected from the extrapolation of the $\nu_{3/2}\nu_{4}$ band $system^{2}$.
Description
1. J.P. champion, M. Loete, G. Pierre, Spherical Top Spectra in “The Spectroscopy of the Earth Atmosphere and Interstellar Medium” edited by K.N. Rao and A. Weber , Academic Press, New York(1992) 2. G. Pierre and M. Takami, Unpublished results. 3. R.K. Heenan and A.G. Robiette, Unpublished results.
Author Institution: Laboratoire de Phyisique, Universite de Bourgogne; Computing Service, Oxford University; Molecular Physics Division, National Institute of Standards and Technology
Author Institution: Laboratoire de Phyisique, Universite de Bourgogne; Computing Service, Oxford University; Molecular Physics Division, National Institute of Standards and Technology