Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 34.1: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Towards Ultracold Chemistry - Scattering of Ba+ and Rb in an optical dipole trap — •Alexander Lambrecht, Thomas Huber, Michael Zugenmaier, Julian Schmidt, Leon Karpa, and Tobias Schaetz — Albert-Ludwigs-Universität Freiburg

Examining collisions of atoms and ions at extremely low velocities permits to gain information about the corresponding scattering potentials and therefore of quantum effects in chemical reactions. In the last years several experimental groups investigated cold collisions between atoms and ions, leading to better understanding of the atom-ion interaction in many different aspects[1-3]. Our approach to reach the regime of ultracold collisions is to precool a barium+ ion, trapped in a conventional Radio-Frequency (RF) trap, by doppler cooling followed by sympathetic cooling via an ambient rubidium MOT. By spatially overlapping the ion and the atom ensemble within a bichromatic optical dipole trap we overcome the limitations set by heating due to the RF micromotion[4]. We describe the experimental apparatus in its recent stage and the first experiments towards the simultaneous optical trapping of ions and atoms. [1]A.T.Grier, M.Cetina, F.Orucevic and V.Vuletic, Phys.Rev.Lett.102,223201(2009) [2]C.Zipkes, S.Palzer, C.Sias and M.Koehl, nature 464, 388 (2010) [3]W.G.Rellergert, S.T.Sullivan, S.Kotochigova, A.Petrov, K.Chen, S.J.Schowalter and E.R.Hudson, Phys.Ref.Lett. 107,243201 (2011) [4]L.H.Nguyen, A.Kalev, M.D.Barret and B.Engelert, Phys.Rev.A 85,052718 (2012)