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A: Atomphysik
A 21: Poster II: Multikoinzidenz Imaging
A 21.10: Poster
Donnerstag, 16. März 2006, 16:30–18:30, Labsaal
PHOTO DOUBLE IONIZATION OF HYDROGEN MOLECULES AT THRESHOLD — •Thorsten Weber1,2, Markus Schöffler1, Lothar Schmidt1, Jasmin Titze1, Birte Ullrich1, Lutz Foucar1, Ottmar Jagutzki1, Horst Schmidt-Böcking1, Reinhard Dörner1, Timur Osipov3, Mike Prior3, Allen Landers4, and Lew Cocke5 — 1Institut für Kernphysik, Universität Frankfurt, Germany — 2DESY Hamburg, Germany — 3Lawrence Berkeley National Laboratory, UC Berkeley, USA — 4206 Allison Laboratory, Auburn University, USA — 5Dept. of Physics, Kansas State University, USA
We have studied experimentally the influence of the molecular alignment and spacing on the electron emission from a two body Coulomb potential induced by single photon absorption with 50 eV. Applying successfully the technique of COLTRIMS it was possible to measure doubly differential cross sections (DDCS) for the photo double ionization of hydrogen for fixed in space molecular orientations by detecting three particles in coincidence. The measurements covered 4pi solid angle.
We present angular distributions of one electron studying the influence of symmetry effects, selection rules and molecular orientations in body fixed frames. Although only one of the two electrons was measured, the angular distributions show a distinct dependency on the molecular orientation and on the Kinetic Energy Release (KER) of the recoiling ions.
Some of the experimental results can be compared with quantum mechanical calculations.