Abstract
We have measured the interference between the direct and exchange scattering amplitudes in electron impact ionization of atomic hydrogen over the energy range 15 to 197 eV in a crossed-beams experiment utilizing spin-polarized electrons and spin-polarized hydrogen atoms. The experimental values for the asymmetry $A=\frac{({\ensuremath{\sigma}}^{\ensuremath{\uparrow}\ensuremath{\downarrow}}\ensuremath{-}{\ensuremath{\sigma}}^{\ensuremath{\uparrow}\ensuremath{\uparrow}})}{({\ensuremath{\sigma}}^{\ensuremath{\downarrow}\ensuremath{\uparrow}}+{\ensuremath{\sigma}}^{\ensuremath{\uparrow}\ensuremath{\uparrow}})}$ in the total ionization cross section for antiparallel and parallel incident- and atomic-electron spins are inconsistent with all theoretical calculations below 50 eV.
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