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Title:Spectral line shape parameters for the ν1, ν2, and ν3 bands of HDO: self and CO2 broadened
Author(s):Devi, V. Malathy
Contributor(s):Villanueva, Geronimo L.; Smith, Mary Ann H.; Mantz, Arlan; Renaud, Candice L.; Gamache, Robert R.; Crawford, Timothy J.; Sung, Keeyoon; Benner, D. Chris
Subject(s):Small molecules
Abstract:To provide precise information relevant to Martian atmospheric remote sensing, high resolution high signal-to-noise ratio spectra of HDO in mixture with CO$_2$ were recorded in the $\nu_1$, $\nu_2$, and $\nu_3$ fundamental bands between 2.7 and 7 $\mu$m regions. The spectra were obtained with the Bruker IFS-125HR Fourier transform spectrometer at the Jet Propulsion Laboratory along with two specially built coolable absorption cells with path lengths of 0.2038 m\footnote{K. Sung, A.W. Mantz, M.A.H. Smith, L.R. Brown, T.J. Crawford, V.M. Devi, D.C. Benner. J. Mol. Spectrosc. 162 (2010) 124-134.} and 20.941 m\footnote{A.W. Mantz, K. Sung, T.J. Crawford, L.R. Brown, M.A.H. Smith, V.M. Devi, D.C. Benner, J. Mol. Spectrosc. 304 (2014) 12-24.} at various sample gas temperatures ($\sim$220 – 296 K), total sample pressures and volume mixing ratios. A multispectrum nonlinear least squares technique\footnote{D.C. Benner, C.P. Rinsland, V. Malathy Devi, M.A. H. Smith, and D. Atkins. JQSRT 53 (1995) 705-721.} was applied to fit simultaneously all the spectra obtained. The measured line parameters include accurate line positions, intensities, self- and CO$_2$-broadened Lorentz halfwidth and pressure-shift coefficients, and temperature dependences of CO$_2$ broadened HDO halfwidth and pressure-shift coefficients. Line mixing coefficients using the relaxation matrix formalism and quadratic speed dependence parameters were also measured where appropriate. Example results for select transitions in each band will be presented and comparisons made to other measured/calculated values\footnote{Research described in this paper are performed at the College of William and Mary, Jet Propulsion Laboratory, California Institute of Technology, Connecticut College, and NASA Langley Research Center under contracts and cooperative agreements with the National Aeronautics and Space Administration. RRG and CLR were supported by the National Science Foundation through Grant \# AGS-1156862.}.
Issue Date:2016-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper/Presentation
Sponsor:RRG and CLR were supported by the National Science Foundation through Grant \# AGS-1156862.
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2016-08-22

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