Laboratory spectroscopy of nitrogen-broadened methane at 79 K to 297 K

Details Laboratory spectroscopy of nitrogen-broadened methane at 79 K to 297 K Laboratory spectroscopy of nitrogen-broadened methane at 79 K to 297 K

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ttt..work...64s&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

Computer Science

Scientific paper

To support the remote sensing of Titan's atmosphere, we studied the temperature dependence of the nitrogen-broadened spectrum of the three most abundant methane isotopomers (12CH4, 13CH4, and CH3D) in the 7.5-micron region. For this purpose a temperature stabilized cryogenic cell, cooled by a closed-cycle helium refrigerator, was designed to be fit into the sample compartment of a Bruker high-resolution Fourier transform spectrometer. Two generations of this cell, built at Connecticut College, have been used to record N2-broadened methane spectra with the Bruker IFS-125HR spectrometer at the Jet Propulsion Laboratory (JPL). Nitrogen-broadened spectra of all three methane isotopomers were recorded at temperatures between 79.3 K and 297.1 K. The spectra are analyzed using a multispectrum fitting technique to determine the temperature-dependences of line widths, pressure-induced shifts, and line mixing parameters. Preliminary results will be shown and compared with the few available literature values. The research described in this paper was performed at NASA Langley, the Jet Propulsion Laboratory, California Institute of Technology, Connecticut College, and the College of William and Mary under contracts and grants with the National Aeronautics and Space Administration.

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