Ionization of H and He/sup +/ by electrons and positrons colliding at near-threshold energies

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.34.2822· OSTI ID:5146372

Wetmore, A E; Olson, R E

Ionization cross sections for the four combinations of electrons and positrons on H and He/sup +/ have been calculated at energies near the threshold for ionization using the classical trajectory Monte Carlo method. In addition, charge-exchange (positronium formation) cross sections have been calculated for the positron-impact collisions. The ionization cross sections compare well with the predictions of the Wannier and Klar models and experimental observations. Our results indicate that the Wannier-type threshold behavior may extend to higher energies than was previously thought. In addition, we have calculated two of the collision parameters, the angle and the relative separation between the escaping particles, used in the Wannier and Klar models, and find good agreement with the values predicted by these theories.

• Research Organization: Physics Department and Laboratory for Atomic and Molecular Research, University of MissouriRolla, Rolla, Missouri 65401
• OSTI ID: 5146372
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 34:4; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640303 -- Atomic
Molecular & Chemical Physics-- Positronium
Muonium
& Muonic & Mesic Atoms & Molecules
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRON-ION COLLISIONS
ELEMENTS
ENERGY
ENERGY DEPENDENCE
HELIUM IONS
HYDROGEN
ION COLLISIONS
IONIZATION
IONS
MONTE CARLO METHOD
NONMETALS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRON-ION COLLISIONS
POSITRONIUM
THRESHOLD ENERGY