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

Measurement of collisions between rubidium atoms and optically dark rubidium ions