Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51a0776s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA51A-0776
Physics
0317 Chemical Kinetic And Photochemical Properties, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 5407 Atmospheres: Evolution
Scientific paper
There are numerous processes in the atmospheres of the terrestrial planets which involve the production of energetic atoms with translational energies considerably above thermal values. These hot atoms can play an important role in enhanced reaction rates, nonthermal emissions, and in particular the enhanced nonthermal escape of atmospheric species. In this talk, we present a new analytical result for the velocity distribution function of the hot atoms produced by dissociative recombination. Our calculation takes into account different temperatures of the electrons and ions and arbitrary dependence of the cross section on the relative velocity of the colliding particles. We compare this analytic result with previous Monte-Carlo simulations. We use our result to study the production of hot oxygen atoms in the upper atmosphere of the terrestrial planets. Thermalization of the hot oxygen is described using a linearized Boltzmann equation at the altitudes at which the thermal oxygen is still a dominant species and with a nonlinear Boltzmann equation at higher altitudes where the hot oxygen becomes the main component of the atmosphere.
Kabin Konstantin
Shizgal Bernie D.
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