Oxygen Trapping in Icy Satellite Surfaces

Details Oxygen Trapping in Icy Satellite Surfaces Oxygen Trapping in Icy Satellite Surfaces

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p21a..03t&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P21A-03

Other

5405 Atmospheres (0343, 1060), 5422 Ices, 5470 Surface Materials And Properties, 6218 Jovian Satellites, 6280 Saturnian Satellites

Scientific paper

The detection of condensed O2 and/or ozone on the surfaces of some satellites orbiting within the magnetospheres of Jupiter and Saturn was attributed to the trapping of radiolytic oxygen in their icy surfaces, but previous experiments showed rapid out-diffusion of O2 from laboratory O2-H2O ice mixtures, which suggested that only very small concentrations of oxygen could be trapped in water ice. Here, we show that irradiation of ice by 100 keV ions produces radiation defects that trap large amounts of O2. The oxygen traps in a highly concentrated subsurface layer, which we investigate with secondary ion mass spectrometry. Simultaneous ion irradiation and water condensation further enhances the buildup of trapped O2 and leads to the production of ozone in the ice. Thus, in addition to other precursor species trapped in their surfaces, models describing the production of ozone and the sputtering of oxygen from icy astronomical bodies in radiation environments must account for the possibility of large amounts of trapped O2.

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