Energy Relaxation In Collisions Of Hydrogen And Deuterium With Oxygen Atoms

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Energy Relaxation In Collisions Of Hydrogen And Deuterium With Oxygen Atoms

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Title: Energy Relaxation In Collisions Of Hydrogen And Deuterium With Oxygen Atoms
Author: Dalgarno, Alexander; Zhang, Peng; Kharchenko, Vasili A.; Jamieson, M.J.

Note: Order does not necessarily reflect citation order of authors.

Citation: Zhang, Peng, Vasili A. Kharchenko, M. J. Jamieson, and Alexander Dalgarno. 2009. Energy relaxation in collisions of hydrogen and deuterium with oxygen atoms. Journal of Geophysical Research 114: A0710.
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Abstract: 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.
Published Version: doi:10.1029/2009JA014055
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at
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  • FAS Scholarly Articles [8111]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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