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

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/92JA02606· OSTI ID:6607372

Hodges, Jr, R R ^[1]

---

1. Univ. of Texas at Dallas, Richardson (United States)

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 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. 20 refs., 6 figs.

• OSTI ID: 6607372
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 98:A3; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110
661320 -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATMOSPHERES
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
BEHAVIOR
COLLISIONS
CROSS SECTIONS
DEUTERIUM
DIFFERENTIAL CROSS SECTIONS
DIFFUSION
EARTH ATMOSPHERE
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
HYDROGEN
HYDROGEN ISOTOPES
INTERACTIONS
ION COLLISIONS
ION-ATOM COLLISIONS
ISOTOPES
LIGHT NUCLEI
MILLI EV RANGE
MOMENTUM TRANSFER
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXYGEN
PLANETARY ATMOSPHERES
PLANETS
SCATTERING
STABLE ISOTOPES
THERMAL DIFFUSION
THERMOSPHERE
TOTAL CROSS SECTIONS