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 10.9: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Experimental observation of the vibrational wavefunction of helium dimers using strong laser-fields — Jörg Voigtsberger1, •Stefan Zeller1, Jasper Becht1, Nadine Neumann1, Felix Sturm1,2, Maksim Kunitski1, Anton Kalinin1, Jian Wu1,3, Markus Schöffler1, Wieland Schöllkopf4, Achim Czasch1, Lothar Ph. H. Schmidt1, Robert Grisenti1, Till Jahnke1, and Reinhard Dörner1 — 1Goethe Universität 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
Helium gas is being expanded through a pre-cooled 5 µm nozzle in a supersonic gas jet at low temperatures. Containing small clusters this gas jet passes a transmission diffraction grating, separating clusters of different masses. The first order dimer diffraction peak is overlapped with a femtosecond Ti:Sa Laser and ionised. The Coulomb exploding ionic fragments are measured with the COLTRIMS technique, giving direct access to the square of the vibrational wavefunction. The enormous size and the small binding energy can be directly accessed via this approach.