v/2 electrons inH++H ionizing collisions

Classical-trajectory Monte Carlo calculations are used to determine the velocity and angular dependence of the electron ionized in the ${\mathrm{H}}^{+}$+H→${\mathrm{H}}^{+}$+${\mathrm{H}}^{+}$+${\mathrm{e}}^{\mathrm{-}}$ collision. The energy range studied is 40–200 keV. At energies E≤60 keV, ionized electrons with velocities that are near one-half (v/2) the relative velocity v of the collision dominate the electron spectra. At higher energies the maximum position of the ionized electrons shifts and is found centered about the target nucleus.