Hannover 2016 – scientific programme

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A: Fachverband Atomphysik

A 26: Ultra-cold atoms, ions and BEC II (with Q)

A 26.7: Talk

Wednesday, March 2, 2016, 16:00–16:15, f303

Towards Ultracold Interaction and Chemistry - Ba⁺ and Rb in an optical dipole trap — •Alexander Lambrecht, Julian Schmidt, Pascal Weckesser, Leon Karpa, and Tobias Schaetz — Universitaet Freiburg

Examining collisions of atoms and ions at extremely low temperature will permit gaining information about the corresponding sympathetic cooling rates and subsequent quantum effects, such as cluster formation of an ion binding atoms within the common 1/r⁴ potential[1]. In the last years several experimental groups investigated cold collisions between atoms and ions, leading to a better understanding of the atom-ion interaction [2-5]. Our approach to reach the regime of ultracold interaction is to precool a Ba⁺ ion, trapped in a convential Radio-Frequency (RF) trap by Dopper cooling. By transfering the ion into an optical dipole trap[6], followd by sympathetic cooling via an ambient Rb MOT we plan to overcome the current limitations set by heating due to RF micromotion. We describe our apparatus and present first experimental results on optical trapping of ions and atoms.
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