Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 40: Poster: Ultra-cold atoms, ions and BEC
A 40.17: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.V
Interaction of ultracold rubidium atoms with trapped OH−-ions — •Bastian Höltkemeier1, Simone Götz1, Matthias Weidemüller1, Thorsten Best2, Roland Wester2, and Johannes Deiglmayr3 — 1Physikalisches Institut, Philosophenweg 12, 69120 Heidelberg — 2Institut f. Ionenphysik und Angewandte Physik, Technikerstraße 25/3, 6020 Innsbruck — 3Laboratory of Physical Chemistry, ETH Hönggerberg, Wolfgang-Pauli-Strasse 10, 8093 Zürich
Based on previous experiments on ion-atom reactions, we present a new setup to investigate the interaction of ultracold rubidium atoms in a Dark-SPOT and mass-selected OH−-water clusters. The ions are trapped in an octupole RF-trap consisting of thin wires instead of metal rods to give maximum optical access.
In first experiments, this setup will be used to investigate cooling of the ions due to collisions with the neutral Rb-atoms. For efficient cooling a dense cloud of atoms preferably in the ground state, to minimize ion-losses due to collisions with excited atoms, is needed. In a recent experiment we succeeded in creating a cloud of 4× 108 atoms at a peak density of up to 3× 1011atoms/cm3 which can be loaded in less than two seconds from a 2D-MOT. In this Dark-SPOT we estimated that about 95 % of the atoms are in the ground state, perfectly fulfilling our requirements for efficient cooling of ions. This setup will now be adapted for our future OH− experiments.