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- W2014014332 abstract "Double ionization of helium at high projectile velocities, $v$, is considered in terms of two mechanisms. In the shakeoff mechanism the ratio of double- to single-ionization cross sections, $frac{{ensuremath{sigma}}^{mathrm{ii}}}{{ensuremath{sigma}}^{i}}$, is independent of $v$. In the two-step mechanism it is shown that $frac{{ensuremath{sigma}}^{mathrm{ii}}}{{ensuremath{sigma}}^{i}}ensuremath{sim}{({v}^{2}mathrm{ln}v)}^{ensuremath{-}1}$. Combining amplitudes gives a reasonable fit to the observed velocity dependence as well as an explanation of the observed factor-of-2 differences between double ionization of helium by protons and electrons near $vensuremath{simeq}10{v}_{mathrm{Bohr}}$." @default.
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- W2014014332 date "1982-10-18" @default.
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- W2014014332 title "Double Ionization of Helium by Protons and Electrons at High Velocities" @default.
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- W2014014332 doi "https://doi.org/10.1103/physrevlett.49.1153" @default.
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