Coulomb Born approximation for electron scattering from neutral atoms: application to electron impact ionization of helium in coplanar symmetric geometry
- 28 August 1991
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 24 (16) , L405-L411
- https://doi.org/10.1088/0953-4075/24/16/006
Abstract
A new perturbation series in which the electron-electron interaction is treated perturbatively is used to compute (e,2e) cross sections for helium in coplanar symmetric geometry at energies of 100 and 200 eV. The perturbation theory is written such that the slow decrease of the Coulomb potential in which the incoming and scattered particles move becomes irrelevant, and so do the asymptotic conditions of the zero-order wavefunctions. The authors compute the triple differential cross section using Coulomb waves with an effective charge for the incoming, scattered and ejected electrons and find very good agreement with experiment and with previous calculations, especially in that there is a double peak in the cross section, with a deep dip at an angle close to 90'.Keywords
This publication has 12 references indexed in Scilit:
- Triply-differential cross sections for ionization of helium by electronsJournal of Physics B: Atomic, Molecular and Optical Physics, 1991
- 200 eV coplanar symmetric (e,2e) on helium: a sensitive test of reaction modelsJournal of Physics B: Atomic, Molecular and Optical Physics, 1990
- Absolute cross sections for 100 eV electron impact ionization of helium in a symmetric energy-sharing geometryJournal of Physics B: Atomic, Molecular and Optical Physics, 1990
- Double scattering in energy-sharing (e, 2e) reactionsJournal of Physics B: Atomic, Molecular and Optical Physics, 1989
- Triply-differential cross sections for ionisation of hydrogen atoms by electrons and positronsJournal of Physics B: Atomic, Molecular and Optical Physics, 1989
- Perturbation approximations for scattering amplitudes in ion-atom collisionsPhysical Review A, 1988
- Second-order effects in large-angle coplanar symmetric (e, 2e) processesJournal of Physics B: Atomic and Molecular Physics, 1983
- Differential cross sections for high-energy electron capture in the impulse approximationJournal of Physics B: Atomic and Molecular Physics, 1982
- Some remarks on integral expressions for scattering amplitudesJournal of Physics B: Atomic and Molecular Physics, 1968
- Theory of Electron Impact Excitation and Ionization of Atoms and IonsPhysical Review B, 1967