Line Parameters Of CH3CN From 305 To 415 cm-1

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Mapping important compounds, such as hydrocarbons and nitriles, is needed in order to understand the photochemical cycle of Titan and how it couples with the dynamics to produce organic aerosols. For this, the CIRS spectrometer (Composite Infrared Spectrometer) on board Cassini is currently recording rotation and vibration-rotation spectra of Titan between 10 and 1400 cm-1. To support analysis of these data, high resolution laboratory spectra of CH3CN have been recorded using Fourier transform spectrometers at PNL and LISA. This paper presents a prediction of line positions and intensities of CH3 CN for the ν&8 fundamental and the 2ν8 -ν8 hot band (located near 360 cm&-1). Analyses of the two fundamentals near 10 microns are in progress.
Part of the research described in this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with The National Aeronautics and Space Administration. I.K, J. O and A. D. also want to thank the Programme National de Planétologie for funding part of this research. This research was supported, in part, by the United States Department of Energy, Office of Basic Energy Sciences, Chemical Sciences Division and the experimental part was performed at the W. R, Wiley Environmental Molecular Science Laboratory, a national scientific user facility sponsored by the Department of Energy's Office of Biological and Environmental Research located at the Pacific Northwest National Laboratory. Pacific Northwest National Laboratory is operated for the United States Department of Energy by Battelle under contract DE-AC06-76RLO 1830. We wish to thank Drs R. Antilla and S. Alanko for kindly making available supplemental data in electronic and paper forms.
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