Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets

MO 27.15: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Cold Atom-Molecule Collision Studies at tunable velocities — •Matthias Strebel, Steffen Spieler, Ingo Hügel, Frank Stienkemeier, and Marcel Mudrich — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str 3, D-79104 Freiburg

Slow beams of cold molecules or atoms produced by a rotating nozzle are scattered with magneto-optically trapped lithium (Li) atoms. Elastic scattering cross sections are measured for Li + rare gas atoms and SF6 molecules as a function of kinetic energy down to about 1 meV. Comparison with theory reveals the quantum nature of the collision dynamics, including both rainbow scattering as well as orbiting resonances.

The suitability of a MOT as a scattering target for low-energy collision experiments with regard to the particular kinematics resulting from a resting target and diagnostics such as fluoresence imaging as a measure for integral cross sections is discussed.

Furthermore we present a thin charged wire as a guiding element for beams of cold and slow polar molecules. Experimental results indicate that ND3 molecules in high field seeking Stark states can be guided along the wire in order to enhance the detected beam density.