On the sources of ultraviolet absorption in spectra of Titan and the outer planets

Details On the sources of ultraviolet absorption in spectra of Titan and the outer planets On the sources of ultraviolet absorption in spectra of Titan and the outer planets

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...30..780s&link_type=abstract

Icarus, vol. 30, Apr. 1977, p. 780-788. NSF-supported research;

Other

8

Absorption Spectra, Astronomical Spectroscopy, Atmospheric Composition, Planetary Atmospheres, Titan, Ultraviolet Absorption, Hydrogen, Methane, Photochemical Reactions, Spectrum Analysis, Upper Atmosphere

Scientific paper

In response to observations of the ultraviolet deficiencies shown by all of the outer planets and Titan, models have been proposed to explain the low albedos in terms of absorption by particles in the upper atmospheres of these objects. These particles are generally believed to be photochemically formed from gases in the upper atmospheres, primarily methane and hydrogen. Such processes may also be operative on Titan. Results of some laboratory experiments on proton irradiation of mixtures of gases including CH4, H2, and NH3 have shown that liquid and solid materials are produced that are strong ultraviolet absorbers. However, the material produced from the CH4 + H2 mixture was colorless, indicating that species containing elements other than carbon and hydrogen are necessary for the production of color. Two such elements are nitrogen (as NH3 or N2) and sulfur (as H2S); colored materials have been produced from such mixtures. None of these materials has spectral properties identical to those shown by the planets. Therefore it is necessary that mixtures (and/or cloud layers) of the photochemical materials be present.

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