The Partitioning of Oxygen Bearing Species on the Surface of Ganymede

Details The Partitioning of Oxygen Bearing Species on the Surface of Ganymede The Partitioning of Oxygen Bearing Species on the Surface of Ganymede

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0429y&link_type=abstract

American Astronomical Society, DPS meeting #28, #04.29; Bulletin of the American Astronomical Society, Vol. 28, p.1076

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent observations (Spencer et al. 1995; Calvin et al. 1996; Noll et al. 1996) reported the detection of O_2 and O_3 on the surface of Ganymede. We examined a simple model of oxygen bearing species in the ice matrix and annealed cracked. The ultimate source of oxygen is the destruction of water ice by UV photons and energetic particles, followed by the preferential escape of hydrogen from the ice. The oxygen that is left behind can accumulate either in the ice matrix or in the annealed cracks in the ice. The important oxygen species in the ice are O_2, O_3, O and O((1) D). The partitioning of these species is strongly affected by photolysis, recombination and heterogeneous chemistry in the ice. Radical species (e.g. O atoms) are adsorbed on the surface, where they can recombine or react with molecules that impinge on the surface. It is shown that the absolute abundance of total oxygen may be estimated as a balance between the net source from high energy radiation and its ultimate loss to the atmosphere by solid state diffusion. The O_3/O_2 ratio may be used as a diagnostic of what type of chemistry is most important in the ice.

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