Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.1708c&link_type=abstract
American Astronomical Society, DPS meeting #35, #17.08; Bulletin of the American Astronomical Society, Vol. 35, p.1484
Other
Scientific paper
Sputtering, the ejection of particles following ion impact, has been studied in the lab and on the computer for a variety of target materials and ions. Applying this knowledge to airless bodies in our solar system is complicated by regolith geometry. This geometry determines the distribution of angles encountered by ions, and thus the sputter yield from individual grains. Further, the majority of sputter products encounter other regolith grains, after which they may either desorb or permanently stick. This issue has implications for the process of sputter fractionation and phenomena such as the Io plasma torus.
A Monte Carlo program has been developed to follow the trajectories of incident ions and their sputter products within a regolith composed of spherical grains. Parameters for the model were taken from experiments on sputtering from flat surfaces.
The program successfully modeled lunar--like basalt. In accord with experiment, it was found that approximately 90 % of sputter products do not leave the regolith. It is hoped that this program can be used to model icy regoliths.
Cassidy Thomas
Johnson Robert E.
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