Doubly differential cross sections (DDCSs) for single ionization of molecular hydrogen by 75-keV proton impact have been measured and calculated as a function of the projectile scattering angle and energy loss. Interference structures are observed in the scattering angular dependence of the DDCSs, which disappear, however, at electron speeds near the projectile speed. The comparison to our calculations shows that the projectile-target nucleus interaction plays a central role. Furthermore, our data suggest that for a given scattering angle, ionization favors well-defined molecular orientations.
J. S. Alexander et al., "Interference Effects Due to Projectile Target Nucleus Scattering in Single Ionization of H₂ by 75-keV Proton Impact," Physical Review A, American Physical Society (APS), Dec 2008.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.78.060701
Max-Planck-Institut für Physik Komplexer Systeme
National Science Foundation (U.S.)
Keywords and Phrases
Energy Loss of Particles; Hydrogen Ions; Hydrogen Neutral Molecules; Ion-Molecule Collisions; Ionisation; Molecular Orientation; Positive Ions
Article - Journal
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