LASER MICROWAVE DOUBLE-RESONANCE EXPERIMENT ON TRAPPED CD-113(+) IONS

The possibility of using Cd+ ions as a microwave frequency standard wh ose light source is all-solid state UV laser system is presented, The ground-state hyperfine splitting of trapped Cd-113(+) ions is measured using an RF trap technique. The transition is detected using a laser microwave double-resonance method in the presence of He buffer gas. Th e splitting is determined to be 15 199 862 858(2) Hz. The preciseness of the value was improved over that in previous data by seven orders o f magnitude. A light source of 214.5 nm is being developed by the auth ors for optical pumping and laser-cooling of Cd+ ions whose fundamenta l oscillator is based on diode lasers.