Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality

MO 10.8: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Imaging the structure of pure and isotopic helium trimers — •Jörg Voigtsberger¹, Stefan Zeller¹, Jasper Becht¹, Nadine Neumann¹, Felix Sturm^1,2, Maksim Kunitski¹, Anton Kalinin¹, Jian Wu^1,3, Markus Schöffler¹, Wieland Schöllkopf⁴, Dario Bressanini⁵, Achim Czasch¹, Klaus Ullmann-Pfleger¹, Lothar Ph. H. Schmidt¹, Robert Grisenti¹, Till Jahnke¹, and Reinhard Dörner¹ — ¹Universität Frankfurt a.M., Institut für Kernphysik, Frankfurt, Germany — ²Lawrence Berkeley National Laboratory, Chemical Sciences Division, Berkeley, USA — ³East China Normal University, State Key Lab of Precision Spectroscopy, Shanghai, China — ⁴Fritz-Haber-Institut der Max-Planck-Gesellschaft, Dep. of Mol. Phys., Atom and Molecule Optics, Berlin, Germany — ⁵University of Insubria, Department of Chemical and Environmental Sciences, Corno, Italy

We were able to measure the structure of ⁴He₃ and ⁴He₂³He by ionizing a jet of trimer clusters with a femtosecond Ti:Sa Laser. After expanding the gas through a precooled 5µm nozzle, clusters of different mass were separated by a transmission diffraction grating. Ionization with a strong laser field led to a coulomb explosion of the trimer. In a ColTRIMS apparatus the 3d momenta of all ionized fragments were measured, giving a direct access to the structure of the trimer. Results are compared to recent theory.