Collision cross sections and diffusion parameters for H and D in atomic oxygen

Details Collision cross sections and diffusion parameters for H and D in atomic oxygen Collision cross sections and diffusion parameters for H and D in atomic oxygen

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3799h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3799-3805.

Other

11

Earth Atmosphere, Oxygen Atoms, Particle Collisions, Scattering Cross Sections, Thermosphere, Venus Atmosphere, Diffusion Coefficient, Monte Carlo Method, Particle Diffusion

Scientific paper

Modeling the behavior of H and D in planetary exospheres requires detailed knowledge of the differential scattering cross sections for all of the important neutral-neutral and ion-neutral collision processes affecting these species over their entire ranges of interaction energies. In the upper atmospheres of Earth, Venus, and other planets as well, the interactions of H and D with atomic oxygen determine the rates of diffusion of escaping hydrogen isotopes through the thermosphere, the velocity distributions of exospheric atoms that encounter the upper thermosphere, the lifetimes of exospheric orbiters with periapsides near the exobase, and the transfer of momentum in collisions with hot O. The nature of H-O and D-O collisions and the derivation of a data base consisting of phase shifts and the differential, total, and momentum transfer cross sections for these interactions in the energy range 0.001 - 10 eV are discussed. Coefficients of mutual diffusion and thermal diffusion factors are calculated for temperatures of planetary interest.

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