Isotopic Ratios In Titan's Methane

Details Isotopic Ratios In Titan's Methane Isotopic Ratios In Titan's Methane

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1331n&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1331

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This paper describes the first simultaneous measurement of the abundances of all three known minor isotopologues of methane in Titan's atmosphere (13CH4, 12CH3D, and 13CH3D), by fitting of Cassini CIRS mid-infrared spectra at 7-9 μm. Two separate estimates of each isotopic ratio - D/H and 12C/13C - are therefore derived, and give a combined D/H = (1.59±0.26)×10-4 and 12C/13C = 86±8. These are in general agreement with terrestrial ratios, and also recent Titan estimates from the Huygens probe GCMS [5]. Cosmological implications of these values are discussed.

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