Escape of H and D from Mars and Venus by energization with hot oxygen

Details Escape of H and D from Mars and Venus by energization with hot oxygen Escape of H and D from Mars and Venus by energization with hot oxygen

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10414833s&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A7, p. 14833-14846

Physics

11

Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solar System Objects: Venus, Planetology: Solar System Objects: Mars, Meteorology And Atmospheric Dynamics: Thermospheric Dynamics

Scientific paper

A kinetic theory collisional production model is used to determine the product velocity distributions of H and D resulting from collisional energy transfer with hot oxygen. The energetic oxygen atoms are the products of the dissociative recombination of O2+. Quantum mechanical cross sections for O-H and O-D collisions are used to determine the production distributions. The distributions of the particles entering a collision are assumed to be Maxwellian functions. The fraction of atoms with speeds above the escape speed is determined for Venus and Mars. For Venus, available density and temperature profiles are used to obtain estimates of the H and D escape fluxes and fractionation ratios.

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