Determination of the ground-state hyperfine splitting of trappedCd+113ions

Abstract
The ground-state hyperfine splitting of trapped Cd+113 ions has been measured to be 15 199 862 858(2) Hz. The transition was detected by a laser microwave double-resonance method in the presence of He buffer gas. The result was corrected for the second-order magnetic-field dependence. This paper also discusses the possibility of using Cd+ ions as a microwave-frequency standard. © 1996 The American Physical Society.