Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets

MO 19.25: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Stopping intense beams of internally cold molecules via centrifugal forces — •Xing Wu, Thomas Gantner, Martin Zeppenfeld, Sotir Chervenkov, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany

Cryogenic buffer-gas cooling produces intense beams of cold molecules [1][2]. It offers a versatile source for studying collision dynamics and reaction pathways in the cold regime, and a variety of other applications. In order to be trapped and further cooled [3], these cold molecular beams still need to be decelerated. Here, we demonstrate that intense and continuous beams of electrically guided molecules produced by a cryogenic buffer-gas cell [2], can be brought to a halt by the centrifugal force in a rotating frame [4]. In addition, our RF-resonant depletion detection shows that up to 90% rotational-state purity can be achieved in the so-produced cold molecular beams. In combination with complete trajectory simulations which resolve the guiding efficiency for different states, it allows us to determine the internal temperature of these buffer-gas cooled molecules.

[1] J. D. Weinstein et al., Nature 395, 148 (1998)

[2] L.D. van Buuren et al., Phys. Rev. Lett. 102, 033001 (2009)

[3] M. Zeppenfeld et al., Nature 491, 570 (2012)

[4] S. Chervenkov et al., Phys. Rev. Lett. 112, 013001 (2014)