Abstract
Electron-impact detachment cross sections for H- are calculatedusing time-dependent close-coupling theory.The three-electron wavefunction is expanded in terms of a productof a frozen core 1s hydrogenic wavefunction and a correlatedtwo-electron wavefunction which fully describes the ejected andscattered electrons at all times following the collision.Ejected-energy differential and total integrated cross sectionsare calculated at 10 eV and 20 eV incident electron energy.Equal energy anomalies in the differential cross section areavoided by direct projection of the time-dependent wavefunctiononto lattice continuum eigenstates.The total cross sections are in excellent agreement with previousion storage ring experiments, while the differential cross sectionresults confirm Monte Carlo perturbation theory in predictinga zero energy signature which should be common to all negative ions.
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