Phys. Rev. Lett. 93, 233201 (2004) [4 pages]Threshold Behavior of e-H Ionizing CollisionsReceived 11 August 2004; published 29 November 2004 We present accurate ab initio numerical solutions of the full Schrödinger equation for the electron-impact ionization of hydrogen near threshold using the propagating exterior complex scaling method. They provide strong support for the Wannier threshold law [ Phys. Rev. 90 817 (1953)], giving σ∝E1.122±0.015, and also give the energy dependence of the electrons' angular distribution as (π-θ12)FWHM≈3.0E1/4, in general agreement with classical and semiclassical predictions. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.233201
DOI:
10.1103/PhysRevLett.93.233201
PACS:
34.80.Dp
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