FT-IR measurements of cold cross sections of benzene (C6H6) for CASSINI/CIRS

Sung, Keeyoon

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https://hdl.handle.net/2142/50791 Copy

Description

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

Issue Date

2014-06-20

Keyword(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.}

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50791

DOI

https://doi.org/10.15278/isms.2014.FE11

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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