FIRST HIGH RESOLUTION ANALYSIS OF THE $\nu_{1}$, $\nu_{2}$, $\nu_{3}$, $\nu_{4}$, $\nu_{5}$, AND $\nu_{6}$ BANDS OF $COF^{35}Cl$ IN THE $600-2000 cm^{-1}$ REGION
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Date
2001
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Publisher
Ohio State University
Abstract
Concern about the implication of chlorofluorocarbons (CFCs) on the amounts of ozone in the earth's atmosphere has led to the measurement of the concentration of halogen containing compounds in the stratosphere. Of the various possible oxidation products of CFC's in the stratosphere, carbonyl chlorofluoride $COFCl$ may receive attention. $COFCl$ is formed by the reaction of freonll $(CFCl_{3})$ with $O(^{1}D)$ oxygen atoms which are formed by photolysis of $ozone^{a, b}$. High resolution atmospheric infrared spectra are potential means of monitoring $COFCl$. However, there is only little information on the spectroscopy of this molecule in the literature. We have recorded spectra of a $^{35}Cl$ enriched sample of $COFCl$ at $ca. 0.002 cm^{-1}$ resolution with the BRUKER Fourier transform spectrometer of the University of Wuppertal. We present here the first high resolution analyses of the six fundamentals $\nu_{1}$, $\nu_{2}$, $\nu_{3}$, $\nu_{4}$, $\nu_{5}$ and $\nu_{6}$ bands located at 1875.8, 1095.1, 764.4, 501.6, 408.8 and $666.6 cm^{-1}$ respectively for the $^{35}Cl$ isotopic species of $COFCl$. According to the results of the analyses, the $\nu_{3}$, $\nu_{4}$, $\nu_{5}$, $\nu_{6}$ are unperturbed, while the analyses of the $\nu_{2}$ and $\nu_{1}$ bands was complicated by numerous resonances. Excellent results were obtained for the $\nu_{3}$, $\nu_{4}$, $\nu_{5}$, $\nu_{6}$ bands and for the perturbed $\nu_{2}$ band. On the other hand, for the $\nu_{1}$ band for which the resonance scheme is more complex, the results of the analysis are still less satisfactory.
Description
$^{a}$J.A.Kaye, A.R.Douglass, Ch.H.Jackman, R.S.Stolarski, R.Zander and G.Roland, J. Geophys. Res., D96, 12865, (1991) $^{b}$F.Wu, and R.W.Carr, J. Phys. Chem. 96, 1743, (1992)
Author Institution: Atmospheric Sciences, Universit\'e Paris Sud, Campus d'Orsay; Laboratoire de Photophysique Mol\'eculaire, CNRS; Laboratoire de Photophysique Mol\'eculaire, FB 9 - Anorganische Chemie Universit\""at; Laboratoire de Photophysique Mol\'eculaire, FB 6 - Anorganische Chemie Universit\""at
Author Institution: Atmospheric Sciences, Universit\'e Paris Sud, Campus d'Orsay; Laboratoire de Photophysique Mol\'eculaire, CNRS; Laboratoire de Photophysique Mol\'eculaire, FB 9 - Anorganische Chemie Universit\""at; Laboratoire de Photophysique Mol\'eculaire, FB 6 - Anorganische Chemie Universit\""at