Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.50: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
Visualizing the vibrational motion of D2 by XUV-Pump/XUV-Probe experiments at FLASH — •yuhai jiang1, artem rudenko2, etienne plésiat3, lutz foucar2, moritz kurka1, kai-uwe kühnel1, jhon pérez3, fernando martin3, oliver herrwerth4, matthias lezius4, matthias kling4, till jahnke5, ali belkacem6, michael schulz7, kiyoshi ueda8, theo zouros9, stefan düsterer10, rolf treusch10, claus dieter schröter1, robert moshammer1, and joachim ullrich1 — 1MPIK, 69117 Heidelberg — 2ASG at CFEL, 22607 Hamburg — 3Universidad Autónoma de Madrid, 28049 Madrid — 4MPIQ, 85748 Garching — 5Universität Frankfurt, 60486 Frankfurt — 6LBNL, 94720 Berkeley — 7University of Missouri-Rolla, 65409 Rolla — 8Tohoku University, 980-8577 Sendai — 9University of Crete, 71003 Heraklion, Crete — 10DESY, 22607 Hamburg
Two-photon double ionization (TPDI) of D2 is studied for 38 eV photons at FLASH as function of the time delay between the two photo-absorption events using a XUV-pump/XUV-probe setup in combination with a reaction microscope. Instantaneous and sequential absorption pathways are identified as separated peaks in the measured D++D+ fragment kinetic energy release spectra. Sequential TPDI exhibits clear pump-probe delay time dependent structures originating from the ultrafast nuclear wave-packet motion in D2+ (1sσg-state). Time-dependent model calculations support this interpretation and are in agreement with the experimentally observed vibrational period of 22±4 fs (D2+).