We have measured fully differential single ionization cross sections for 75 keV p+He collisions. At this relatively small projectile velocity, signatures of the projectile-residual-target-ion interaction, which are not observable for fast projectiles and for electron impact, are revealed rather sensitively. In fact, this interaction appears to be more important than the postcollision interaction, which so far was assumed to be the most important factor in higher-order effects for slow ion impact. These features are not well reproduced by our three-distorted-wave calculations.
N. V. Maydanyuk et al., "Projectile-Residual-Target-Ion Scattering After Single Ionization of Helium by Slow Proton Impact," Physical Review Letters, American Physical Society (APS), Jan 2005.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.94.243201
National Science Foundation (U.S.)
Keywords and Phrases
Atom-Ion Collisions; Helium Neutral Atoms; Hydrogen Ions; Ionisation; Positive Ions
Article - Journal
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