Miao K, Zhang J W, Sun X L, Wang S G, Zhang A M, Liang K, Wang L J
Opt Lett. 2015 Sep 15;40(18):4249-52. doi: 10.1364/OL.40.004249.
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.
近年来，一种基于激光冷却的（113）Cd（+）离子的微波频率标准已被开发出来，其短期频率不稳定性经测量为6.1×10（-13）/√τ。通过将Cd（+）时钟与一个更优的频率基准进行比较，（113）Cd（+）的基态超精细分裂被精确测量为15199862855.0192（10）Hz，分数精度为6.6×10（-14）。该结果与先前的结果一致，并且测量精度比之前报道的最佳结果提高了近一个数量级。
