The abundance of CH3D in the atmosphere of Titan,derived from 8- to 14-μm thermal emission |
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| Authors: | Sang J. Kim John Caldwell |
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| Affiliation: | Department of Earth and Space Sciences, State University of New York at Stony Brook, Stony Brook, New York 11794, USA |
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| Abstract: | The 8.6-μm emission feature of Titan's infrared spectrum was analyzed using the Voyager temperature-pressure profile. Although both C3H8 and CH3D have bands at that wavelength, we show that CH3D dominates the observed emission on Titan. We derived a CH3D/CH4 mixing ratio using this band and the strong CH4 band at 7.7 μm. The corresponding D/H ratio is 4.2?1.5+2 × 10?4, neglecting deuterium fractionation with other molecules. The main uncertainty in this value comes from the continuum emission characteristics. The D/H ratio is apparently significantly enhanced on Titan with respect to published values for Saturn. |
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