Measurements of Methane at 7.5 μm Broadened by Nitrogen at Low Temperatures

Details Measurements of Methane at 7.5 μm Broadened by Nitrogen at Low Temperatures Measurements of Methane at 7.5 μm Broadened by Nitrogen at Low Temperatures

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4808s&link_type=abstract

American Astronomical Society, DPS meeting #42, #48.08; Bulletin of the American Astronomical Society, Vol. 42, p.971

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Since the ν4 band system of methane (CH4) at 7.5 µm appears prominently in infrared spectra of Titan's atmosphere, we are conducting laboratory studies to examine the temperature-dependence of infrared transitions of CH4 broadened by N2 in this spectral region. Spectra of methane-nitrogen mixtures at temperatures from 79 to 297 K were obtained at 0.006 cm-1 resolution (resolving power = 2x105) using the Bruker IFS 125HR Fourier transform spectrometer at the Jet Propulsion Laboratory with new temperature-controlled gas cells designed specifically to fit in the spectrometer's sample compartment. Details of the cells and spectrometer performance [1] are described in an adjacent poster by Sung et al. A multispectrum nonlinear least squares technique [2] is used to fit selected intervals of 9 or more spectra simultaneously to obtain the temperature dependences of line broadening, pressure-induced shift and line mixing parameters. Results for 13CH4 at 80 to 297 K are discussed relative to our previous high-resolution studies of air- and self-broadened 12CH4 and 13CH4 [3-5] at terrestrial atmospheric temperatures (210 to 314 K).
This research is supported by NASA's Planetary Atmospheres Program.
1. K. Sung et al., J. Mol. Spectrosc. (2010) doi:10.1016/j.jms.2010.05.004.
2. D. Chris Benner et al., J. Quant. Spectrosc. Radiat. Transfer 53 (1995) 705-721.
3. M. A. H. Smith et al., J. Quant. Spectrosc. Radiat. Transfer 110 (2009) 639-653.
4. M. A. H. Smith et al., J. Quant. Spectrosc. Radiat. Transfer 111 (2010) 1152-1166.
5. M. A. H. Smith et al., J. Quant. Spectrosc. Radiat. Transfer (2010) submitted.

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