Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0260k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0260
Physics
0325 Evolution Of The Atmosphere (1610, 8125), 0328 Exosphere
Scientific paper
The momentum-energy transfer is investigated for interacting atmospheric H and O gases. Accurate differential cross-sections are used to evaluate the energy transfer rates in collisions of fast oxygen and thermal H atoms in the upper Martian and terrestrial atmospheres. Collisionally induced escape fluxes of H and D isotopes from the Martian atmosphere are computed at different solar conditions. Rate of energy relaxation of fast H atoms in the thermal O gas in the upper Martian and terrestrial atmospheres are determined from solutions of the Boltzmann kinetic equation describing a thermalization process. We have computed parameters, characterizing the H and O energy relaxation in planetary atmospheres: the energy relaxation rate, number of collisions required for a thermalization, averaged energy transferred per collision, and thermalization time. Interaction between H and O atoms is investigated for the upper atmospheres of Mars and Earth.
Dalgarno Alexander
Kharchenko Vasili
Zhang Pei-Pei
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