Measurement of collisions between rubidium atoms and optically dark rubidium ions

Abstract

We measure the collision rate coefficient between laser cooled Rubidium (Rb) atoms in a magneto-optical trap (MOT) and optically dark Rb+ ions in an overlapping Paul trap. In such a mixture, the ions are created from the MOT atoms and allowed to accumulate in the ion trap, which results in a significant reduction in the number of steady state MOT atoms. A theoretical rate equation model is developed to describe the evolution of the MOT atom number, due to ionization and ion-atom collision, and derive an expression for the ion-atom collision rate coefficient. The loss of MOT atoms is studied systematically, by sequentially switching on the various mechanisms in the experiment. Combining the measurements with the model allows the direct determination of the ion-atom collision rate coefficient. Finally the scope of the experimental technique developed here is discussed.

9 pages, 6 figures

References in corpus (8)

• A trapped single ion inside a Bose-Einstein condensate
• Dynamics of a cold trapped ion in a Bose-Einstein condensate
• Light-assisted ion-neutral reactive processes in the cold regime: radiative molecule formation vs. charge exchange
• Millikelvin Reactive Collisions between Sympathetically-Cooled Molecular Ions and Laser-Cooled Atoms in an Ion-Atom Hybrid Trap
• Sympathetic and swap cooling of trapped ions by cold atoms in a MOT
• A single ion as a three-body reaction center in an ultracold atomic gas
• Trapping molecular ions formed via photo-associative ionization of ultracold atoms
• Combined ion and atom trap for low temperature ion-atom physics

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