Kinematically complete experiment on single ionization in 75-keV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>He</mml:mi></mml:mrow></mml:math>collisions

We have measured and calculated fully differential single-ionization cross sections for the complete three-dimensional space in $75\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ $p+\mathrm{He}$ collisions. Several signatures of the projectile--residual-target-ion interaction, some of which are not observable for fast projectiles and for electron impact, are revealed. Some of these features are qualitatively reproduced by our calculations if this interaction is accounted for. However, overall the agreement between theory and experiment is not very good. Thus, our understanding of effects caused by the projectile--residual-target-ion interaction appears to be rather incomplete.

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