We demonstrate an ion shuttling technique for high-resolution control ofatom-ion collision energy by translating an ion held within a radio-frequencytrap through a magneto-optical atom trap. The technique is demonstrated bothexperimentally and through numerical simulations, with the experimental resultsindicating control of ion kinetic energies from $0.05-1$ K with a fractionalresolution of $\sim10$ and the simulations demonstrating that kinetic energycontrol up to $120$ K with a maximum predicted resolution of $\sim100$ ispossible, offering order-of-magnitude improvements over most alternativetechniques. Lastly, we perform a proof-of-principle chemistry experiment usingthis technique and outline how the method may be refined in the future andapplied to the study of molecular ion chemistry.

High-resolution collision energy control through ion position modulation in atom-ion hybrid systems