Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Poster: Femtosecond Spectroscopy
MO 7.10: Poster
Dienstag, 9. März 2010, 16:00–18:30, Lichthof
Observation of vibrational wave packet dynamics in MgH+ — •Steffen Kahra1, Günther Leschhorn1, Hsiang-Tai Dou1, Tobias Schaetz1, Agustin Schiffrin2, Ralph Ernstorfer2, Reinhard Kienberger2, Markus Kowalewski3, and Regina de Vivie-Riedle3 — 1Max-Planck-Institut für Quantenoptik, Garching, TIaMo — 2MPQ, Garching, AS beam lines — 3Department Chemie and Biochemie, LMU München
We report measurements that demonstrate the combination of precise spatial control and initialization of single molecular ions in a Paul trap with temporal resolution provided by <5 fs UV laser pulses. In this proof of method experiment we show how the temporal evolution of a vibrational wave packet (vibrational period 31 fs) in a few distinguishable isolated molecules can be followed by a dissociative pump probe scheme. We describe the way to load and identify individual molecular ions in our trap and especially concentrate on how to count them reliably before and after the pump probe delay dependent dissociation. It is this time dependence that reflects the molecular motion and gives rise to our experimental signal. Additionally to the vibrational content of the measured oscillation curve recent theoretic insight predicts that fast components from electronic relaxation processes will contribute significantly to the signal. A similar experiment using a different excitation spectrum in the UV might allow us to distinguish between the different contributions to the oscillatory signal and thus spotlight the fast dynamic components.