Hannover 2013 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics
MO 19.6: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
Controlled molecules for rotational dynamics studies — Sebastian Trippel1, Terence G. Mullins1, •Nele L. M. Müller1, Jens S. Kienitz1, Karol Długołecki1, and Jochen Küpper1,2,3 — 1Center for Free-Electron Laser Science, DESY, Hamburg — 2Department of Physics, University of Hamburg — 3Center for Ultrafast Imaging, University of Hamburg
Controlled molecule imaging increases the amount of observable information when investigating molecular dynamics using photoelectron imaging using table-top or free-electron lasers, or electron diffraction. With our new experimental setup we aim for studying ultrafast dynamics of large and complex molecules directly in the molecular frame. We prepare molecules in cold (1 K), supersonic molecular beams at a repetition rate of 1 kHz. These beams are quantum-state selected by deflection in dc electric fields [1] and, subsequently, laser aligned and mixed-field oriented by strong picosecond laser fields and weak dc electric fields. Molecular-frame photoelectron angular distributions of the strong-field-ionized molecules are recorded using velocity map imaging, providing direct information on the electronic structure [2]. The nuclear, geometric structure can be observed using, for instance, x-ray diffraction [3], ultrafast electron diffraction, or angular distributions of short-wavelength photoelectrons. Time-resolved studies will be used to probe, for instance, rotational dynamics of molecules.
[1] see poster by Jens Kienitz et al.
[2] Holmegaard et al., Nat. Phys. 6, 428 (2010)
[3] see poster by Stephan Stern et al.