Abstract
We report the first experimental results on the state selective cross-section ratio ${\mathrm{\ensuremath{\sigma}}}^{+\mathrm{*}}$/${\mathrm{\ensuremath{\sigma}}}^{\mathrm{*}}$ of helium for electron and proton impact. Our results show consistently higher yields for electrons than for protons at higher velocities. A comparison is made between the cross-section ratios ${\mathrm{\ensuremath{\sigma}}}^{2+}$/${\mathrm{\ensuremath{\sigma}}}^{+}$ of helium for electron and proton impact.
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