- Conference date: 25-28 July 2001
- Location: Rolla, Missouri (USA)
Energies near the ionization threshold present a particular challenge for electron-impact ionization calculations. The effect of electron-electron correlation is stronger at lower energies where qualitatively different behavior in the differential cross sections has been predicted. Most of the predictions of the near-threshold behavior have come from semi-classical work. Besides the famous “Wannier threshold law” for the total ionization cross section there are predictions of a flattening of the energy-sharing cross section and a change in shape of the symmetric, co-planar, triply differential cross section. In the case of hydrogen, the near-threshold behavior is expected to be observable within a few eV of threshold. Using the method of exterior complex scaling we can produce accurate wave functions for electron-impact ionization of hydrogen. From these we can extract the complete ionization amplitude. To the extent that comparison is possible, our results agree well with experimental data and the predictions of semi-classical theory.
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