CHARGE TRANSFER BETWEEN A LASER-COOLED ION AND A THERMAL ATOM IN A RADIO-FREQUENCY TRAP Taro Hasegawa and Tadao Shimizu Science University of Tokyo in Yamaguchi The charge transfer between a laser-cooled magnesium ion and a thermal barium atom in a radio-frequency ion trap is observed. The merit of using the trap is that the generated ion is confined. The charge transfer is confirmed by the laser-induced fluorescence.