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Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster I

A 8.51: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

Isomerisation of Acetylene followed in Real-Time by Pump-Probe experiments at FLASH — •yuhai jiang1, artem rudenko2, lutz foucar2, moritz kurka1, kai-uwe kühnel1, oliver herrwerth3, matthias lezius3, matthias kling3, till jahnke4, ali belkacem5, michael schulz6, kiyoshi ueda7, theo zouros8, stefan düsterer9, rolf treusch9, claus dieter schröter1, robert moshammer1, and joachim ullrich11MPIK, 69117 Heidelberg — 2ASG at CFEL, 22607 Hamburg — 3MPIQ, 85748 Garching — 4Universität Frankfurt, 60486 Frankfurt — 5LBNL, 94720 Berkeley — 6University of Missouri-Rolla, 65409 Rolla — 7Tohoku University, 980-8577 Sendai — 8University of Crete, 71003 Heraklion, Crete — 9DESY, 22607 Hamburg

Isomerisation is an elementary chemical reaction where the conformation of a molecule evolves continuously through a sequence of transient species that are neither reactants nor products, but finally turning the former into the latter. Using a XUV-Pump/XUV-Probe setup in combination with a reaction microscope we were able to visualize the isomerisation of acetylene cations (HC=CH+) that were created by ionization of neutral molecules in the gas phase during the pump pulse (38 eV photon energy). This has been achieved by analyzing the C++CH2+ fragmentation channel, which serves as an indicator for the transfer of a proton from one end of the molecule to the other end, as function of the pump-probe delay time. We obtained a mean isomerization time of about 50 fs.

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