THE FAR-INFRARED SPECTRUM OF $ClNO_{2}$ (NITRYL CHLORIDE)

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1997

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Ohio State University

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$CINO_{2}$ is a molecule of potential stratospheric and tropospheric importance, formed by heterogeneous reactions on polar stratospheric clouds and sea-salt particles. In 1994, high-resolution infrared spectra of $ClNO_{2}$ were measured and analyzed in the $500-2500 cm^{-1}$ $range^{g}$. However, up to now, no high-resolution absorption spectra of the $\nu_{3}$ and $\nu_{3}$ fundamental bands of $ClNO_{2}$ in the far-infrared region were reported, except for microwave observation of a few transitions in the excited vibrational $states^{h}$. In the present study, absorption spectra in $300-500 cm^{-1}$ range were recorded at resolutions of up to $0.0017 cm^{-1}$, using the Bruker IFS-120HR FTS at University of Giessen. Using these spectra, nearly 2000 transitions of the a-type $\nu_{3}$ band around 370 $cm^{-1}$ were assigned. The b-type $\nu_{3}$ band around $411 cm^{-1}$ is too weak to be observed, in agreement ab-initio predictions. However, the ($\nu_{2}-\nu_{3}$) a-type difference band was observed and could be used to confirm rotational constants of both vibrational states.

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Author Institution: Institute of Environmental Physics, University of Bremen; LPMA, CNRS, University of Paris-Sud; Institute of Physical Chemistry, University of Giessen

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