Theoretical collision-induced rototranslational absorption spectra for modeling Titan's atmosphere - H2-N2 pairs

Details Theoretical collision-induced rototranslational absorption spectra for modeling Titan's atmosphere - H2-N2 pairs Theoretical collision-induced rototranslational absorption spectra for modeling Titan's atmosphere - H2-N2 pairs

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..495b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 495-510.

Astronomy and Astrophysics

Astrophysics

35

Absorption Spectra, Atmospheric Models, Molecular Collisions, Molecular Rotation, Satellite Atmospheres, Titan, Astronomical Models, Hydrogen, Line Shape, Nitrogen, Pair Production, Saturn Satellites, Saturn, Satellites, Titan, Theoretical Studies, Collisions, Absorption, Spectra, Models, Atmosphere, Hydrogen, Nitrogen, Gases, Molecules, Frequencies, Temperature, Intensity, Calculations, Interaction, Iris, Isotropy, Voyager Missions, Infrared Interferometer Spectrometer

Scientific paper

The collision-induced rototranslational absorption coefficient of the H2-N2 molecular complex at frequencies from 0 to beyond 1000/cm, and at temperatures from 50 to 300 K (for which no laboratory measurements exist), is computed from theory. Quadrupolar and hexadecapolar induction of both species, H2 and N2, are accounted for, and a rigorous quantum line shape formalism combined with numerical procedures is used. The present uncertainties of computed intensities arise mainly from the uncertainties of the H2-N2 interaction potential. For the first time, a theoretical description of the spectral features of H2-N2 dimers in the isotropic potential approximation is given. The work is of interest for a detailed analysis of the Voyager IRIS spectra of Titan's atmosphere, especially in the regions of the rotational S0 and S0(1) lines of hydrogen, from about 200 to 700/cm. Exact line shape calculations are complex and expensive. Therefore, simple, six-parameter model line shape functions are defined which allow the reproduction of results of quantum calculations in seconds, on computers of small capacity, with a numerical accuracy of better than 2 percent.

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