Saddle-point electrons in proton-impact ionization of H: A classical trajectory study

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.5878· OSTI ID:7058768

Bandarage, G; Parson, R ^[1]

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1. Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, CO (USA) National Institute of Standards and Technology, Boulder, CO (USA)

Ionization in H(1{ital s})+H{sup +} collisions is studied in the relative collision energy range 4.0--25.0 keV by classical trajectory simulations. Improved total ionization cross sections are reported for the collision energies 2.0--10.0 keV. A thorough study of the qualitative dynamics of ionization has been carried out, with emphasis placed on the distinction between direct-impact'' and saddle-point'' mechanisms. A precise criterion for classifying trajectories according to these mechanisms is given, and by analyzing the trajectories in a quasistatic molecular frame it is shown that the distinction is established early in the collision. The development of position and velocity-space correlations in ensembles of trajectories of each type is studied.

• OSTI ID: 7058768
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:11; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
ELEMENTS
ENERGY RANGE
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
KEV RANGE
KEV RANGE 10-100
NONMETALS
SADDLE-POINT METHOD
TRAJECTORIES