Distorted-wave Born approximation for inelastic collisions: Application to electron capture by positrons from hydrogen atoms

Journal Article · Mon Sep 01 04:00:00 EDT 1980 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.22.968· OSTI ID:5056543

Shakeshaft, R; Wadehra, J M

We have re-examined the distorted-wave Born approximation for inelastic collisions. We find that the distortion in the relative motion of the collision partners cannot be neglected even for high-energy ion-atom collisions. Furthermore, if the distortion in the relative motion is not treated exactly, post-prior discrepancies will occur. We have applied the distorted-wave Born approximation, with distortion included through first order, to ground-state-to-ground-state electron capture by positrons from hydrogen atoms. The results are presented in this paper. We have also examined the nonrelativistic asymptotic behavior of the cross section for electron capture from hydrogen by positrons incident with a speed v approx. infinity. We find that, for e/sup 2//hv << 1, capture occurs primarily to states of positronium that have an odd orbital-angular-momentum quantum number. It follows that the cusp signifying charge transfer to the continuum will, for positron impact, be symmetric when e/sup 2//hv << 1.

• Research Organization: Physics Department, Texas AandM University, College Station, Texas 77843
• OSTI ID: 5056543
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 22:3; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular &amp; Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ATOM COLLISIONS
BORN APPROXIMATION
CAPTURE
CHARGE EXCHANGE
COLLISIONS
CRYOGENIC FLUIDS
DWBA
ELECTRON CAPTURE
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
HYDROGEN
ION COLLISIONS
ION-ATOM COLLISIONS
LEPTONS
NONMETALS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRONIUM
POSITRONS