Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9215067k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 30, 1987, p. 15067-15082.
Physics
35
Aerosols, Hydrocarbons, Neptune Atmosphere, Planetary Composition, Solid Phases, Uranus Atmosphere, Atmospheric Composition, Simulation, Thin Films
Scientific paper
Solid hydrocarbon films were deposited in an RF plasma discharge of various CH4/H2/He mixtures under conditions simulating the formation of solid aerosols by magnetospheric charged particles in the stratospheres of Uranus and Neptune. The percentage of CH4 ranged from 0.0002 to 100 percent; the pressure in the discharge chamber was either 130 or 660 microbar; and the films produced were yellow to deep red-brown in color and 2-25 microns thick. The real and imaginary parts of the refractive index at wavelengths from 350 nm to 2.5 microns were determined for all the films, and the results are compared with observational data and the predictions of theoretical models in extensive tables and graphs. Good agreement is demonstrated, suggesting that aerosol production by this mechanism may be competitive with UV or charged-particle irradiation of hydrocarbon condensates.
Arakawa Edward T.
Khare Bishun N.
Reid Thompson W.
Sagan Carl
Votaw P.
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