Title

Single Ionization of Helium by 102 eV Electron Impact: Three-Dimensional Images for Electron Emission

Abstract

Single ionization of helium by 102 eV electron impact has been studied by measuring the momentum vectors of all final-state particles, i.e., two electrons and the He+ ion, with an advanced reaction microscope. Fully differential cross sections for asymmetric scattering geometry, which have been normalized to an absolute scale, have been obtained covering a large range of emission angles for the emitted low-energy (E ⩽ 15 eV) electron and different scattering angles for the fast electron. Strong electron emission out of the projectile scattering plane is confirmed for electron impact, as was observed before for heavy-ion impact ionization. The data are compared with theoretical predictions from a three-Coulomb wavefunction model, first-order and second-order distorted-wave approaches, as well as a convergent close-coupling calculation.

Department(s)

Physics

Sponsor(s)

Australian Research Council
Australian Research Council
European Union
National Science Foundation (U.S.)

Keywords and Phrases

Atomic Excitation; Atomic Ionization; Atomic Physics; Molecular Physics

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 Institute of Physics - IOP Publishing, All rights reserved.

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