Stuttgart 2012 – scientific programme
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A: Fachverband Atomphysik
A 23: Poster: Electron scattering and recombination
A 23.2: Poster
Tuesday, March 13, 2012, 16:30–19:00, Poster.V
Multiple scattering in electron impact ionization of aligned H2 molecules — Xueguang Ren, Thomas Pflüger, Arne Senftleben, •Alexander Dorn, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, 69117 Heidelberg
Ionization of molecular hydrogen (H2) by 54 eV electron impact is investigated with an advanced reaction microscope. The alignment of the H2 molecular axis during the collision is determined by the post-collision dissociation process of the H2+ ion. By triple-coincidence detection of the proton and both final state electrons the complete collision kinematics is determined. Therefore, fully differential cross sections for fixed in space molecular axis were measured. The ejected electron is observed to be emitted into two preferential directions: firstly, along the momentum transfered by the projectile and, secondly, along the molecular axis which involves another scattering process for the ejected electron. A first numerically demanding state-of-the-art theory shows satisfactory agreement with the experimental data.