Research Papers in Physics and Astronomy


Date of this Version

July 1991


Published by American Physical Society. Phys. Rev. Lett. 67, 185 (1991). Copyright © 1991 American Physical Society. Permission to use.


Distorted-wave calculations of the triply differential cross sections for electron-impact ionization of H and He targets are presented for final-state electrons sharing 4-eV excess energy and leaving in opposite directions. The experimentally observed target dependence of the angular distributions is shown to stem essentially from short-range effects on the s-wave phase shifts of both incident and final-state continuum electrons.

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