Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 13: Poster 1: Cold Molecules, Femtosecond Spectroscopy, Molecular Dynamics
MO 13.19: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.IV
Controlling large molecules at kHz repetition rates — Sebastian Trippel1, Terence G. Mullins1, •Nele Müller1, Karol Długołecki1, and Jochen Küpper1,2 — 1Center for Free-Electron Laser Science, DESY, Hamburg — 2University of Hamburg
With our new experimental setup we aim for studying ultrafast dynamics of large and complex molecules directly in the molecular frame. In first benchmark experiments we create supersonic, cold beams of prototypical iodobenzene (C6H5I) molecules at high repetition rates – up to 1 kHz. These molecular beams are quantum-state selected by dc electric fields [1,2] and, subsequently, laser aligned and mixed-field oriented by strong picosecond laser fields and weak dc electric fields [2]. The resulting strongly aligned and oriented molecular samples are characterized by strong-field ionization using femtosecond laser pulses and velocity-map imaging of the produced ions to derive the angular distribution of the molecules. The degrees of alignment and orientation are characterized as a function of repetition rate, state selection, and laser parameters. In the future, the high repetition rate will allow us to investigate weak processes in molecular dynamics, exploiting, for instance, molecular-frame photoelectron angular distributions [3].
[1] F. Filsinger et al., Angew. Chem. Int. Ed., 48, 6900-6902 (2009)
[2] L. Holmegaard et al., Phys. Rev. Lett., 102, 023001 (2009)
[3] L. Holmegaard et al., Nature Physics, 6, 428 (2010)