Computer Science
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66..270h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 66, May 1986, p. 270-279. NASA-supported research.
Computer Science
37
Ion Irradiation, Planetary Geology, Porosity, Regolith, Solar System, Sputtering, Chemical Fractionation, Io, Optical Properties, Surface Roughness
Scientific paper
The present theoretical and experimental consideration of processes that are expected to occur when the porous regoliths on outer solar system bodies lacking atmospheres are subjected to energetic ion bombardment indicates that porosity reduces the effective sputtering yield of a soil by more than an order of magnitude. Between 90 and 97 percent of the sputtered atoms are trapped within the regolith and subjected to differential desorption fractionation, which emerges as the most important path for the alteration of chemical and optical properties in sputtered regoliths. Sputtered porous mixtures of water, ammonia and methane frosts suffer a loss of H, and surface reactions of C, N, and O that should yield complex hydrocarbons and carbohydrates; such reactions may have played a role in the formation of carbonaceous chondrites' matrix material prior to agglomeration.
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