Threshold angular distributions of (e,2e) cross sections of helium atoms
- 3 February 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 68 (5) , 576-579
- https://doi.org/10.1103/physrevlett.68.576
Abstract
Cross sections for the electron-impact ionization of helium atoms in a coplanar symmetric geometry are computed by including in the Coulomb-Born approximation a normalization factor which approximately incorporates electron-electron interactions in the final-state wave function. This approximation yields excellent agreement with recent experimental observations at impact energies between 0.5 and 5 eV above the ionization threshold. It is shown that the angular distributions given by the present theory are in agreement with Wannier’s threshold theory.Keywords
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