Production of ammonia-depleted surface layers on the Saturnian satellites by ion sputtering

Details Production of ammonia-depleted surface layers on the Saturnian satellites by ion sputtering Production of ammonia-depleted surface layers on the Saturnian satellites by ion sputtering

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.312..139l&link_type=abstract

Nature (ISSN 0028-0836), vol. 312, Nov. 8, 1984, p. 139, 140.

Mathematics

Logic

35

Ammonia, Ion Impact, Satellite Surfaces, Saturn Satellites, Surface Layers, Erosion, Planetary Evolution, Sputtering

Scientific paper

Theories of surface processes on the Saturnian satellites Enceladus, Tethys, Dione, Rhea predict that the peritectic melt 2H2OmNH3 should be abundantly present on their surfaces. Spectra, however, have not shown any evidence of ammonia on the surfaces of these satellites. On the basis of laboratory-derived data on the ion erosion of water and ammonia ices, the authors suggest that the satellite surfaces could have become enriched with water ice over a reasonable geological time period (106 - 109 yr) owing to preferential erosion of the ammonia by magnetosphere ion bombardment.

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