Ejected-energy differential cross sections for the electron-impact detachment of H-

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Abstract
Electron-impact detachment cross sections for H- are calculated using time-dependent close-coupling theory. The three-electron wavefunction is expanded in terms of a product of a frozen core 1s hydrogenic wavefunction and a correlated two-electron wavefunction which fully describes the ejected and scattered electrons at all times following the collision. Ejected-energy differential and total integrated cross sections are calculated at 10 eV and 20 eV incident electron energy. Equal energy anomalies in the differential cross section are avoided by direct projection of the time-dependent wavefunction onto lattice continuum eigenstates. The total cross sections are in excellent agreement with previous ion storage ring experiments, while the differential cross section results confirm Monte Carlo perturbation theory in predicting a zero energy signature which should be common to all negative ions.