Spectral line parameters including temperature dependences of N2- and self-broadened widths in the region of the nu9 band of C2H6 using a multispectrum fitting technique

Details Spectral line parameters including temperature dependences of N2- and self-broadened widths in the region of the nu9 band of C2H6 using a multispectrum fitting technique Spectral line parameters including temperature dependences of N2- and self-broadened widths in the region of the nu9 band of C2H6 using a multispectrum fitting technique

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ttt..work...65m&link_type=abstract

Through Time; A Workshop On Titan's Past, Present and Future, NASA Goddard Space Flight Center, April 6th - 8th, 2010. Edited b

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Scientific paper

Ethane is a prominent contributor to the spectrum of Titan, particularly in the region of the nu9 band at 12 micron. A multispectrum nonlinear least squares fitting program was applied to laboratory spectra of ethane to measure accurate positions, absolute intensities, N2- and self-broadened half width coefficients and their temperature dependences for a large number transitions. These measurements include several PQ and RQ sub-bands (and other sub bands such as PP, RR) in the nu9 fundamental band of 12C2H6 centered near 822 cm-1. Positions and intensities were measured for more than 1750 transitions. N2- and self-broadened half width coefficients were measured for over 1450 transitions while the temperature dependence exponents were determined for 1330 transitions. About 1900 additional measurements (mostly line positions and intensities) belonging to the nu9+nu4-nu4 hot band, 13C12CH6 nu9 band and over 500 unidentified transitions were also made in the fitted intervals. Forty-three high resolution (0.0016-0.003 cm-1) infrared laboratory absorption spectra recorded at temperatures between 150 and 298 K were fitted simultaneously in retrieving these parameters. Forty-one of these spectra were recorded in the temperature range of 211-298 K using the Bruker IFS 120HR interferometer located at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington. Two additional spectra at 150 K were obtained using the high resolution Bruker IFS 125HR interferometer of the Jet Propulsion Laboratory (JPL) in Pasadena, California. A specialized cooling cell capable of achieving temperatures down to 70 K was employed to record the 150 K spectra. Constraints pertaining to intensity ratios, doublet separations, half width coefficients and their temperature dependence exponents were written in determining these parameters for each of the two torsional split components. Similar to N2- and self-broadened half width coefficients, their temperature dependence exponents were found to follow distinctively different patterns. Present results will be compared to other available measurements.

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