Computer Science
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...38..115b&link_type=abstract
Icarus, vol. 38, Apr. 1979, p. 115-122. Research supported by the Israel Academy of Sciences and Humanities.
Computer Science
13
Atmospheric Chemistry, Atmospheric Composition, Hydrocarbons, Photochemical Reactions, Titan, Absorption Spectra, Far Ultraviolet Radiation, Methane, Photolysis, Observations, Clouds, Photochemistry, Titan, Atmosphere, Spectrum, Hydrocarbons, Ultraviolet, Methane, Photolysis, Argon, Temperatures, Surface, Ethylene, Abundance, Aerosols, Acetylene, Ethane, Propane, Irradiation, Emissions, Saturn, Satellites
Scientific paper
The photochemistry of hydrocarbons in the atmosphere of Titan is studied by measuring the production rates of various hydrocarbons from the far UV photolysis of methane. A mixture of methane diluted 1000 times with argon was irradiated in the range of 1000 to 1450 A at temperatures of 200 and 300 K and the hydrocarbons produced were measured. It is found that ethylene and acetylene reach a temperature dependent steady state, while ethane and propane rise linearly with time. A comparison with observed abundances indicates that a cold surface acts as a sink for ethane and propane on Titan. Extrapolation of the measured column densities of ethylene to temperatures of 130 and 160 K indicates the top of the UV absorbing aerosol layer to be 4.8 or scale heights above the surface. Acetylene is calculated to have a concentration of 5.1 and 1.5 x 10 to the -4th cm am at 130 and 160 K, respectively.
Bar-Nun Akiva
Podolak Morris
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