@article {409,
title = {Velocity distributions of energetic atoms in planetary exospheres from dissociative recombination},
journal = {Journal of Geophysical Research-Planets},
volume = {107},
number = {E7},
year = {2002},
note = {ISI Document Delivery No.: 610UBTimes Cited: 3Cited Reference Count: 47},
month = {Jul},
pages = {9},
type = {Article},
abstract = {[1] A kinetic theory description of translational energetic atoms in the upper planetary atmosphere is presented. A new analytical result for the velocity distribution of the products of reactive collisions is described. Our calculation takes into account different temperatures of the reactants and arbitrary dependence of the cross section on the relative velocity of the colliding particles. The final result is applied to the production of hot oxygen and carbon by dissociative recombination of O-2(+) and CO+, respectively. The nascent distribution of hot atoms generated in this way is compared with the earlier Monte Carlo calculations. We use the Boltzmann equation to study the thermalization of the hot oxygen via collisions with the thermal oxygen population. The results of this calculation demonstrate quasi-steady state velocity distribution of high-energy oxygen atoms near the exobase of Venus for daytime conditions.},
keywords = {Boltzmann equation, CROSS-SECTIONS, dissociative recombination, ESCAPE, gas kinetic, hot atoms, HOT OXYGEN-ATOMS, HYDROGEN, ION STORAGE-RING, MARS, MONTE-CARLO, NITROGEN-ATOMS, theory, UPPER-ATMOSPHERE, VENUS},
isbn = {0148-0227},
url = {://000178978400004},
author = {Kabin, K. and Shizgal, B. D.}
}
@article {4666,
title = {An analysis of O-H interaction potentials, O-H and O-D collision cross sections, and vibrational states},
journal = {Planetary and Space Science},
volume = {47},
number = {1-2},
year = {1999},
note = {ISI Document Delivery No.: 179JTTimes Cited: 3Cited Reference Count: 29},
month = {Jan-Feb},
pages = {163-174},
type = {Article},
abstract = {A detailed comparison of recently published OH, X(2)Pi, (2)Sigma(-), (4)Pi and (4)Sigma(-) potentials is carried out. These potential functions are important in the accurate determination of O-H and O-D collision cross sections. The isotope effect in the O-H and O-D cross sections plays an important role in the enhanced nonthermal escape of H and D from Mars and Venus. The quantum mechanical elastic scattering cross sections for O-H and O-D collisions are determined with a set of potentials which are constructed with a new interpolation of the short range tabulated potentials and the long range asymptotic behaviour. The important role of the asymptotic radial variation of the potential functions in the determination of the elastic cross sections is studied in detail with a semiclassical analysis, and a comparison is made with previous calculations. The vibrational energies for several different X(2)Pi bound potential functions for OH are also calculated and compared with published results. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.},
keywords = {DISCRETIZATION METHOD QDM, ENERGY, HYDROGEN, MODEL, MOLECULE, OXYGEN, VENUS},
isbn = {0032-0633},
url = {://000079324100017},
author = {Shizgal, B. D.}
}
@article {2995,
title = {RELAXATION DYNAMICS OF HOT PROTONS IN A THERMAL BATH OF ATOMIC-HYDROGEN},
journal = {Physical Review E},
volume = {49},
number = {1},
year = {1994},
note = {ISI Document Delivery No.: MV514Times Cited: 10Cited Reference Count: 58},
month = {Jan},
pages = {347-358},
type = {Article},
abstract = {We present a rigorous kinetic theory formulation of the relaxation of hot protons (H+) in a bath of thermal atomic hydrogen (H). We apply the (well-known) quantum-mechanical scattering theory to (H+,H) collisions and calculate the differential elastic cross section as a function of collision energy and scattering angle. This calculation includes the effects Of both direct and charge-exchange scattering. We then solve the time-dependent Boltzmann equation numerically for the H+ distribution function with an initial delta-function distribution. We also consider two approximate models for the collision dynamics, each based on the assumption that charge exchange dominates the relaxation and that no momentum is transferred in a collision (the linear-trajectory approximation). The first model uses the Rapp-Francis [J. Chem. Phys. 37, 2631 (1962)] energy-dependent cross section in the exact kernel which defines the Boltzmann collision operator. The second model uses a hard-sphere cross section in an approximate collision kernel. We compare the relaxation behavior calculated with the approximate formulations with the exact solution. We also calculate the mobility of H+ in H and compare the exact and-approximate; formulations. This study has applications to processes in astrophysics and aeronomy such as the non-thermal escape of H from planetary atmospheres.},
keywords = {CHARGE-EXCHANGE, COLLISION KERNELS, EIGENVALUES, ENERGIES, equation, ESCAPE, EXOSPHERE, TRANSPORT, VENUS},
isbn = {1063-651X},
url = {://A1994MV51400048},
author = {Clarke, A. S. and Shizgal, B.}
}