Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11407101z&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A7, CiteID A07101
Astronomy and Astrophysics
Astrophysics
4
Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Evolution Of The Atmosphere (1610, 8125), Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Atmospheric Composition And Structure: Planetary Atmospheres (5210, 5405, 5704), Atmospheric Composition And Structure: General Or Miscellaneous
Scientific paper
Collision energy transfer processes between hydrogen, deuterium, and oxygen atoms in the upper atmospheres of the terrestrial planets are studied. A new set of interaction potentials has been constructed using an accurate ab initio method. Full orientation-dependent scattering cross sections have been obtained quantum mechanically and have been incorporated into the construction of the linear Boltzmann kinetic equation describing the energy relaxation process. The isotope and temperature dependence of the energy relaxation parameters have been analyzed. Distributions of the secondary energetic recoil atoms have been computed and the fractions of hot atoms capable of escaping from the atmospheres of the terrestrial planets have been determined. For applications to atmospheric physics and astrophysics, we have computed effective hard sphere cross sections for O + H and O + D collisions that closely reproduce the energy relaxation kinetics obtained from the linear Boltzmann equation. These effective cross sections, which are functions of the laboratory frame collisional energy and the temperature of the bath gas, may be used in simulations of the thermalization of hot O, H, and D atoms and their escape from planets.
Dalgarno Alexander
Jamieson Michael J.
Kharchenko Vasili
Zhang Pei-Pei
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