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 Title: FT-IR measurements of cold cross sections of benzene (C6H6) for CASSINI/CIRS Author(s): Sung, Keeyoon Contributor(s): Toon, Geoffrey C.; Brown, Linda Subject(s): Planetary atmospheres Abstract: Titan’s stratosphere is abundant in hydrocarbons (C$_{x}$H$_{y}$) producing highly complicated and crowded features in the spectra of Cassini/CIRS. Among these, benzene (C$_6$H$_6$) is the heaviest hydrocarbon ever seen in the Titan and cold planets. For this reason, a series of pure and N$_2$-broadened C$_{6}$H$_{6}$ spectra were recorded in the 640 to 1540 \wn region at gas temperatures down to 231 K using a Fourier transform spectrometer (Bruker IFS-125HR) at the Jet Propulsion Laboratory. We report temperature dependent absorption cross sections for three strong fundamental bands (\nub{4}, \nub{14}, \nub{13}). We also derived pseudo-line parameters, which include mean intensities and effective lower state energies on a 0.005 \wn frequency grid, obtained by fitting all the laboratory spectra simultaneously. For the pseudoline generation, details can be found in a JPL MK-IV website, http://mark4sun.jpl.nasa.gov/data/spec/Pseudo). The resulting pseudolines of the strong bands reproduce observed cross sections to within \~{}3 \%. These new results are compared to earlier work, including the C$_{6}$H$_{6}$+N$_{2}$ spectra recorded at PNNL.\footnote{S. W. Sharpe, et al., Appl Spectrosc 58, 1452-1461 (2004); C. P. Rinsland, et al. JQSRT, 109, 2511-2522 (2008).} \footnote{Research described in this paper was performed at the Jet Propulsion Laboratory and California Institute of Technology, under contracts and cooperative agreements with the National Aeronautics and Space Administration.} Issue Date: 2014-06-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Sung, K.; Toon, G.C.; Brown, L. FT-IR MEASUREMENTS OF COLD CROSS SECTIONS OF BENZENE (C6H6) FOR CASSINI/CIRS. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.FE11 Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/50791 DOI: https://doi.org/10.15278/isms.2014.FE11 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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