Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 38: Poster: Atomic clusters (with MO)
A 38.6: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Molecular superfluidity in helium clusters studied using impulsive alignment — Gediminas Galinis1, Luis Mendoza Guillermo Luna1, •Lev Kazak2, Sebastian Göde2, Russell Minns4, Mark Watkins1, Slawomir Skruszewicz2, Robert Irsig2, Andrew Ellis3, Edmon Turcu5, Cephise Cacho5, Emma Springate5, Josef Tiggesbäumker2, Karl-Heinz Meiwes-Broer2, and Klaus von Haeften1 — 1Department of Physics and Astronomy, University of Leicester, UK — 2Institut für Physik, Universität Rostock, Deutschland — 3Department of Chemistry, University of Leicester, UK — 4Department of Chemistry, University of Southampton, UK — 5CLF, STFC, Rutherford Appleton Laboratories, UK
Superfluidity is an intriguing phenomenon commonly associated with frictionless flow. Although this macroscopic effect is well understood, our understanding of how superfluidity evolves on the nanoscale is less extensive.We apply new approach to study superfluidity as a function of the number of helium atoms involved. A femtosecond pump-probe laser setup is used to excite a rotational wavepacket and to follow its propagation in time. The periodically recurring molecular alignment is probed by analyzing the emission characteristics in delayed Coulomb explosion with a velocity map imaging (VMI) spectrometer. First results show CO attached to five helium atoms and rotational features of HCCH-He corresponding to a linear configuration. To maximize the molecular beam intensity and to cope with the associated high gas load we developed a unique, differentially pumped VMI spectrometer.