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A mixed system of cooled and trapped, ions and atoms, paves the way for ionassisted cold chemistry and novel many body studies. Due to the differentindividual trapping mechanisms, trapped atoms are significantly colder thantrapped ions, therefore in the combined system, the strong binary ion$-$atominteraction results in heat flow from ions to atoms. Conversely, trapped ionscan also get collisionally heated by the cold atoms, making the resultingequilibrium between ions and atoms intriguing. Here we experimentallydemonstrate, Rubidium ions (Rb$^+$) cool in contact with magneto-opticallytrapped (MOT) Rb atoms, contrary to the general expectation of ion heating forequal ion and atom masses. The cooling mechanism is explained theoretically andsubstantiated with numerical simulations. The importance of resonant chargeexchange (RCx) collisions, which allows swap cooling of ions with atoms,wherein a single glancing collision event brings a fast ion to rest, isdiscussed.

Sympathetic and swap cooling of trapped ions by cold atoms in a MOT