Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 28: Collisions with electrons and ions (jointly with MO)
A 28.4: Vortrag
Freitag, 23. März 2007, 11:30–11:45, 5M
Kinematically complete experiments on ground-state dissociation of H2 molecules by electron impact — •Arne Senftleben1, Nicole Haag2, Alexander Dorn1, Martin Dürr1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Stockholms universitet, 10691 Stockholm, Sweden
Collisions of molecular hydrogen with 210 eV electrons have been studied kinematically complete, allowing to examine the collision dynamics as detailed as possible. Besides pure ionisation the so-called ground state dissociation channel (GSD) has been investigated where the ionised molecules are excited to the vibrational continuum and subsequently dissociate. This allows to extract the orientation of the molecular axis at the time of the collision. Using a multi-electron recoil-ion momentum spectrometer (reaction microscope) all charged reaction products were detected over a large solid angle. With this technique the GSD of H2 could be examined in a kinematically complete measurement for the first time. Differential cross-sections were obtained as a function of molecular alignment with respect to the projectile beam.