title: High accuracy measurement of the ground-state hyperfine splitting in a ¹¹³Cd⁺ microwave clock.
abstract: A microwave frequency standard based on laser-cooled (113)Cd(+) ions has been developed in recent years, and the short-term frequency instability is measured to be 6.1×10(-13)/√τ. By comparing the Cd(+) clock to a superior frequency reference, the ground-state hyperfine splitting of (113)Cd(+) is measured precisely to be 15199862855.0192(10) Hz with a fractional precision of 6.6×10(-14). This result is consistent with previous results, and the measurement precision is improved by nearly one order more than the best result reported before.
authors.forename: K
authors.initials: K
authors.lastname: Miao
authors.forename: J W
authors.initials: JW
authors.lastname: Zhang
authors.forename: X L
authors.initials: XL
authors.lastname: Sun
authors.forename: S G
authors.initials: SG
authors.lastname: Wang
authors.forename: A M
authors.initials: AM
authors.lastname: Zhang
authors.forename: K
authors.initials: K
authors.lastname: Liang
authors.forename: L J
authors.initials: LJ
authors.lastname: Wang