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Collision cross sections and diffusion parameters for H and D in atomic oxygenModeling 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.
Document ID
19930046815
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hodges, R. R., Jr.
(Texas Univ. Richardson, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A3
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A30812
Funding Number(s)
CONTRACT_GRANT: NSF ATM-91-04652
CONTRACT_GRANT: NAGW-2432
Distribution Limits
Public
Copyright
Other

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