Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 28: Poster: Interaction of matter with ions
A 28.7: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
Interference in Dissociative Ionization of H2+ - Helium Collisions — •Shaofeng Zhang1,2, Daniel Fischer1, Robert Moshammer1, Alexander Voitkiv1, Michael Schulz1, Bennaceur Najjari1, Joachim Ullrich1, and Xinwen Ma2 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Institute of Modern Physics, CAS, Nanchang Road 509, Lanzhou, China
The wave properties of moving particles have gained increasing attention in collision physics in the last decades. One fundamental manifestation arises from the scattering of two atomic centers of diatomic molecules (the so-called Young-type interference). So far, two different kinds of Young-type interference in ion collisions have been reported: One is due to the electron emission from the two molecular centers, where the interference results in a significant modification of the electron energy and angular distributions. In the second branch of interference studies, electron capture involving a molecular projectile or target has been investigated where a strong dependence on the molecular orientation was observed.
In the present study we report on interference in ionization of atoms colliding with molecules. At the Max-Planck-Institut für Kernphysik in Heidelberg, we investigated the dissociative ionization channel in He-H2+ collisions. Interference effects in the momentum transfer patterns as well as in the individual momenta of electrons and He+ -ions are investigated. The experimental results are reproduced by a model based on the first Born approximation.