- and Air-Broadening of 12C16O, 13C16O and 12C18O at 2.3 μm

Details - and Air-Broadening of 12C16O, 13C16O and 12C18O at 2.3 μm - and Air-Broadening of 12C16O, 13C16O and 12C18O at 2.3 μm

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confete03d&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

Computer Science

Atmospheric Species

Scientific paper

High resolution (0.005 Cm-1) absorption spectra of CO and two of its isotopologues (13CO and C18O) were recorded between 3550 and 5250 Cm-1 using the Bruker IFS-125HR Fourier transform spectrometer (FTS) located at the Jet Propulsion Laboratory (JPL) and a specially designed and built coolable 20.38 cm long absorption cell placed within the sample compartment of the FTS. More than 50 spectra of both pure and air-broadened samples of CO, 13CO and C18O were recorded at various temperatures from 150 K to 298 K, with maximum total pressures up to ˜700 Torr. A multispectrum nonlinear least squares spectrum fitting technique was used to determine the spectral line shape parameters including speed dependence, Lorentz halfwidth coefficients, pressure-induced shift coefficients, and off-diagonal relaxation matrix element coefficients for line mixing. These line shape parameters were obtained for both self- and air-broadening, and temperature dependences of these parameters were determined where possible. As previously done in studies of CO_2, rather than retrieving individual line positions and intensities, we constrained them to their theoretical relationships, including Herman-Wallis terms, determining only the band intensities and rovibrational constants. The results are discussed and compared with values reported in the literature.
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D. C. Benner, C. P. Rinsland, V. Malathy Devi, M. A. H. Smith and D. A. Atkins, JQSRT 53 (1995) 705-721.
V. Malathy Devi, D. C. Benner, L. R. Brown, C. E. Miller and R. A. Toth, JMS 242 (2007) 90-117.
Research described in this paper was performed at Connecticut College, the College of William and Mary, NASA Langley Research Center and the Jet Propulsion Laboratory, California Institute of Technology, under contracts and cooperative agreements with the National Aeronautics and Space Administration.

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