Fluffy layers obtained by ion bombardment of frozen methane Experiments and applications to Saturnian and Uranian satellites

Details Fluffy layers obtained by ion bombardment of frozen methane Experiments and applications to Saturnian and Uranian satellites Fluffy layers obtained by ion bombardment of frozen methane Experiments and applications to Saturnian and Uranian satellites

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...63...31c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 63, July 1985, p. 31-38.

Physics

43

Methane, Organic Materials, Proton Irradiation, Saturn Satellites, Solar Activity Effects, Uranus Satellites, Freezing, Ion Irradiation, Low Density Materials, Planetary Evolution, Solar System, Stoichiometry, Planets, Saturn, Uranus, Satellites, Ions, Bombardment, Methane, Experiments, Layers, Physical Properties, Organic Material, Residue, Protons, Density, Infrared, Wavelengths, Spectra, Transmission, Reflectance, Composition, Surface, Hyperion, Iapetus, Formation

Scientific paper

The physicochemical characteristics and changes which occurred when polymer-like molecules formed in frozen CH4 layers because of proton bombardment were exposed to higher fluences were examined experimentally. The original fluences, 2E+16 protons per sq cm at 1.5 MeV energies, was upped to 1E+17 ions per sq cm. The organic molecules obtained after the first bombardment had a density similar to CH4, an amorphous structure, and exhibited a fluffy composition with large voids. Densification was produced by the incidence of higher fluences, as was the presence of methyl, methylene, and carbonyl compounds. The results indicate that the same compounds will be present on Uranian and Saturnian satellites, because CH4 has been observed in abundance in those systems and the laboratory fluences mimicked the solar proton fluences at that distance when the sun was a T Tauri star.

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