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MO: Fachverband Molekülphysik

MO 9: Posters 1: Dichroism, VUV and Xray, Clusters, and Cold Molecules

MO 9.8: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1

Imaging of the He₂ wave function using a free electron laser — •Stefan Zeller¹, Maksim Kunitski¹, Jörg Voigtsberger¹, Anton Kalinin¹, Alexander Schottelius¹, Carl Schober¹, Markus Waitz¹, Hendrik Sann¹, Alexander Hartung¹, Tobias Bauer¹, Martin Pitzer¹, Florian Trinter¹, Christoph Goihl¹, Christian Janke¹, Martin Richter¹, Gregor Kastirke¹, Miriam Weller¹, Achim Czasch¹, Markus Braune², Robert E. Grisenti^1,3, Lothar Ph. H. Schmidt¹, Markus S. Schöffler¹, Joshua B. Williams⁴, Till Jahnke¹, and Reinhard Dörner¹ — ¹Institut fuer Kernphysik, Goethe-Universitaet Frankfurt, 60438 Frankfurt, Germany — ²Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany — ³GSI Helmholtz Centre for Heavy Ion Research, 64291 Darmstadt, Germany — ⁴Department of Physics, University of Nevada, Reno, NV 89557, USA

We report on Coulomb explosion imaging of the wavefunction of the quantum halo system He₂. Each atom of this system is ionized by tunnel ionization in a femto second laser pulse and in a second experiment by single photon ionization employing a free electron laser. We visualize the exponential decay of the probability density of the tunneling particle over distance for over two orders of magnitude up to an internuclear distance of 250 Å. By fitting the slope of the density in the tunneling regime we obtain a binding energy of 151.9 ± 13.3 neV, which is in agreement with most recent calculations [Przybytek et al.,PRL 104, 183003, 2010].