Collision-induced absorption in the far infrared spectrum of Titan

Details Collision-induced absorption in the far infrared spectrum of Titan Collision-induced absorption in the far infrared spectrum of Titan

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...55...63h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 55, July 1983, p. 63-72. Research supported by the Natural Sciences and Engineering Research Counc

Computer Science

18

Absorption Spectra, Infrared Spectra, Satellite Atmospheres, Titan, Absorptivity, Far Infrared Radiation, Methane, Molecular Collisions, Nitrogen, Rotational Spectra, Spectrum Analysis, Saturn, Satellites, Titan, Collisions, Absorption, Infrared, Spectra, Wavelengths, Theoretical Studies, Calculations, Nitrogen, Temperature, Atmosphere, Models, Brightness, Optical Properties, Opacity, Gases, Methane, Clouds, Aerosols, Voyager Missions, Comparisons

Scientific paper

The effects of collision-induced absorption on the far infrared spectrum of Titan have been investigated. After a review of the procedure for the theoretical calculation of the N2 translation-rotational spectrum, new results for the temperature range o 70 to 120 K are reported. These are used as input data for a simple atmospheric model in order to compute the far infrared radiance, brightness temperature, and specral limb function. This source of opacity alone is not capable of explaining the Voyager results. When the collision-induced methane is included, the results are in closer agreement in the range between 200 and 300/cm, suggesting that a more complete treatment of collision-induced absorption including particularly CH4-N2, N2-H2, and H2-H2 results, may provide sufficient opacity to reduce or obviate the need for opacities due to clouds or aerosols in order to explain the observed spectra.

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