Düsseldorf 2007 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Femtosecond Spectroscopy I
MO 12.1: Vortrag
Montag, 19. März 2007, 14:00–14:15, 6D
Coulomb Explosion Imaging of Molecular Hydrogen Anions — •Brandon Jordon-Thaden1, Simon Altevogt1, Dennis Bing1, Max Berg1, Henrik Buhr1, Robin Golser2, Huebert Gnaser3, Oded Heber4, Jens Hoffman1, Holger Kreckel1, Michael Lange1, Mario Mendes1, Oldrich Novotny1, Steffen Novotny1, Henrik Pedersen1, Annemieke Petrignani1, Hillel Rubinstein4, Dirk Schwalm1, Dror Shafir4, Andreas Wolf1, and Daniel Zajfman1,4 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2VERA Laboratory, Universität Wien, Wien, Austria — 3University of Kaiserlautern, Kaiserlautern, Germany — 4Department of Particle Physics, Weizmann Institute of Science, Rehovot, Israel
With the recent confirmation of the existence of H2− and its isotopologues, foil-induced Coulomb Explosion Imaging (CEI) offers a unique and straightforward method to investigate the fundamental structure of the molecular anion characterized by a lifetime on the order of 10 microseconds, large internuclear separations, and large angular momentum quantum numbers. Using an energetic (500 keV/amu) beam and the sub-femtosecond stripping of the molecule in an 5 nm thick diamond-like carbon foil, the total kinetic energy release (KER) of the subsequent Coulomb explosion is determined by event-by-event imaging of the fragments about 2 m downstream. Accounting for effects induced by the foil and the initial, substantial rotational energy, we find the distribution of internuclear distances of the metastable ion. Results will be presented for measurements of H2− and D2−.