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1983-WE-03.jpg 112.7Kb JPEG image Thumbnail of COMBINATIONS AND OVERTONES OF $CF_{4}$

Creators: Pine, A. S.; Robiette, A. G.
Issue Date: 1983
Publisher: Ohio State University
Abstract: The $2\nu_{1} + \nu_{4}, 2\nu_{1} + \nu_{3}$ and $2\nu_{3}$ bands of $CF_{4}$ have been recorded at $T=77K$ with Doppler-limited resolution using a tunable difference-frequency laser. The low temperature increases the resolution by reducing the Doppler width and greatly simplifies the spectra by eliminating hot bands and suppressing the population for $J<40$. The $2\nu_{1} +\nu_{4}$ band is relatively isolated and unperturbed, and its previously unresolved Q branch has been analyzed in the diagonal $F_{4}$ coefficient approximation yielding $m=2445.59644(2) cm^{-1}, v=-6.54004(22)^{*}10^{-4} cm^{-1}$ and $ g=-2.48897(43)^{*}10^{-5} cm^{-1}$ with a fit good to $1.1^{*}10^{-4} cm^{-1}$rms. The $2\nu_{1} + \nu_{3}$ band is strongly affected by Fermi resonance with $2\nu_{1} + 2\nu_{4}$, and this resonance is presently being analyzed. The $2\nu_{3}$ spectrum shows a dominant $F_{2}$ component, but Coriolis coupling to the E component is also important in determining the detailed rotational structure. One striking feature of $2\nu_{3}$ is a high J subband-head within the $Q^{\circ}$ branch which had been mistakenly identified as the band center in prior lower resolution studies.
Description: Author Institution: Molecular Spectroscopy Division, National Bureau of Standards; Department of Chemistry, University of Reading Whiteknights
Other Identifiers: 1983-WE-3
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