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Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics

MO 19.2: Poster

Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof

Molecular state selection and species separation by deflection — •Jens S. Kienitz1, Sebastian Trippel1, Terence G. Mullins1, Yuan-Pin Chang1, Nele L. M. Müller1, Stephan Stern1,2, Karol Długołecki1, and Jochen Küpper1,2,31Center for Free-Electron Laser Science, DESY, Hamburg — 2Department of Physics, University of Hamburg — 3Center for Ultrafast Imaging, University of Hamburg

The separation of molecular species and the selection of a certain molecular state are highly beneficial for a wide range of molecular dynamics experiments. We investigate molecules seeded in a supersonic expansion of a cold molecular beam and demonstrate the versatility of the Stark deflector, which exploits a strong inhomogeneous electrostatic field to disperse a beam of the neutral molecules according to the individual effective dipole moments. We utilize the deflector to spatially separate conformers (structural isomers) or invididual cluster sizes, i. e., indole(H2O) clusters from H2O, indole, indole(H2O), indole(H2O)2, and the atomic seed gas. Additionally we present the selection of the lowest-energy rotational states of iodobenzene and carbonyl sulfide and the resulting significant increase of strong alignment and orientation of the molecules. Moreover, we demonstrate how the use of modern molecular beam and laser technology allows us to perform these experiments at kHz repetition rates, providing interesting prospects for novel imaging experiments using light sources, such as table-top XUV lasers, electron guns or short wavelength FELs (see posters by Nele Müller et al and Stephan Stern et al).

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