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 ullrich1 — 1MPIK, 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.