The abundance of CH3D in the atmosphere of Titan, derived from 8- to 14-micron thermal emission

Details The abundance of CH3D in the atmosphere of Titan, derived from 8- to 14-micron thermal emission The abundance of CH3D in the atmosphere of Titan, derived from 8- to 14-micron thermal emission

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...52..473k&link_type=abstract

Icarus, vol. 52, Dec. 1982, p. 473-482.

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25

Atmospheric Composition, Carbohydrates, Infrared Spectra, Satellite Atmospheres, Titan, Abundance, Emission Spectra, Methane, Spectrum Analysis, Voyager Project

Scientific paper

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, the authors show that CH3D dominates the observed emission on Titan. They 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 (with errors +2 and -1.5, respectively) × 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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