title: rf Spectroscopy with a single Ba+ ion.
abstract: We have employed the method of shelving to measure Zeeman resonances of a single trapped Ba+ ion. We use optical pumping to place the ion in a selected magnetic sublevel of either the 6S(1/2) ground state or the 5D(3/2) metastable state. The ion is exposed to an rf field, and a probing/shelving mechanism detects whether spin-flip transitions have taken place. We have observed rf transitions with linewidths of 15 Hz, limited by magnetic-field noise. We have also observed the shift in the Zeeman frequency when the ion is illuminated by off-resonant light. A simultaneous measurement of such light shifts in two atomic states of Ba+ will permit a precise determination of the ratio of transition matrix elements.
authors.affiliation: Department of Physics, Box 351560, University of Washington, Seattle, Washington 98195-1560.
authors.forename: T W
authors.initials: TW
authors.lastname: Koerber
authors.forename: M H
authors.initials: MH
authors.lastname: Schacht
authors.forename: K R G
authors.initials: KR
authors.lastname: Hendrickson
authors.forename: W
authors.initials: W
authors.lastname: Nagourney
authors.forename: E N
authors.initials: EN
authors.lastname: Fortson