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We investigate the energy dependence and the internal-state dependence of thecharge-exchange collision cross sections in a mixture of $^6$Li atoms and$^{40}$Ca$^+$ ions in the collision energy range from 0.2 mK to 1 K.Deliberately excited ion micromotion is used to control the collision energy ofatoms and ions. The energy dependence of the charge-exchange collision crosssection obeys the Langevin model in the temperature range of the currentexperiment, and the measured magnitude of the cross section is correlated tothe internal state of the $^{40}$Ca$^+$ ions. Revealing the relationshipbetween the charge-exchange collision cross sections and the interactionpotentials is an important step toward the realization of the full quantumcontrol of the chemical reactions at an ultralow temperature regime.

Characterization of charge-exchange collisions between ultracold $\rm{^6Li}$ atoms and $\rm{^{40}Ca^+}$ ions