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- W2063797116 abstract "A systematic study of the ionization of atomic hydrogen by electron impact from 0.3 eV to a few eV above the ionization threshold has been carried out using a semiclassical-quantal calculation. Differential and integrated cross sections are presented at 0.3 eV above the energy threshold. Triple-differential cross sections (TDCS) are presented at constant ${ensuremath{theta}}_{12}$ geometry where ${ensuremath{theta}}_{12}=180ifmmode^circelsetextdegreefi{}$ and $150ifmmode^circelsetextdegreefi{}.$ Good agreement is achieved with the measurement [Roder et al., Phys. Rev. Lett. 79, 1666 (1997)] and calculations based on exterior complex scaling at 2 eV and 4 eV above threshold. Results of triple-differential cross sections are also presented at 0.3, 0.5, and 1.0 eV above threshold at both ${ensuremath{theta}}_{12}=180ifmmode^circelsetextdegreefi{}$ and $150ifmmode^circelsetextdegreefi{}.$ At ${ensuremath{theta}}_{12}=180ifmmode^circelsetextdegreefi{}$ the small local maximum in the TDCS around ${ensuremath{theta}}_{1}=90ifmmode^circelsetextdegreefi{}$ reported by Pan and Starace [Phys. Rev. A 45, 4588 (1992)] at 0.5 eV above threshold is not observed in our calculation at energies down to 0.3 eV above threshold. The shape of our double differential cross sections seems to disagree qualitatively with the available calculations as we found two local maxima around $15ifmmode^circelsetextdegreefi{}$ and $165ifmmode^circelsetextdegreefi{}$ in our calculation. Single differential cross sections in our formulation appear naturally as a function of total excess energy E and, therefore, constant for all combinations of individual electron energies ${E}_{1}$ and ${E}_{2}$ with ${E=E}_{1}{+E}_{2}.$ Total ionization cross sections are also compared with measurement and available theoretical calculations and found to be in reasonably good agreement up to 10 eV above ionization threshold." @default.
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- W2063797116 date "2002-05-08" @default.
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- W2063797116 title "Electron-impact ionization of atomic hydrogen close to threshold" @default.
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- W2063797116 doi "https://doi.org/10.1103/physreva.65.052721" @default.
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