Improved Limit on a Temporal Variation of mp/me from Comparisons of Yb+ and Cs Atomic Clocks
Improved Limit on a Temporal Variation of mp/me from Comparisons of Yb+ and Cs Atomic Clocks
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DOI：
10.1103/physrevlett.113.210802
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发表时间：
2014-11-17
影响因子：
8.6
通讯作者：
Peik, E.
中科院分区：
文献类型：
--
作者：
Huntemann, N.;Lipphardt, B.;Peik, E.
随着时间的推移的电子和超精细结构的原子水平之间的不同的跃迁频率的精确测量被用来调查的精细结构常数a和质子-电子质量比μ的时间变化。我们用两个铯原子喷泉钟测量了Yb-171（+）的S-2（1/2）-> F-2（7/2）电八极（E3）跃迁的频率为f（E3）= 642 121 496 772 645.36 Hz，改进的分数不确定度为3.9 × 10 ~（-16）。这种跃迁频率对α的变化表现出很强的敏感性。结合以前和最近对Yb-171（+）中S-2（1/2）-> D-2（3/2）电四极跃迁的一些测量结果以及来自其他元素的数据，最小二乘分析得出（1/alpha）（d α/dt）= -0.20（20）x 10（-16）/年和（1/mu）（d mu/dt）= -0.5（1.6）× 10（-16）/年，证实了先前对d α/dt的限制，并提供了实验室实验中对d mu/dt的最严格限制。
Accurate measurements of different transition frequencies between atomic levels of the electronic and hyperfine structure over time are used to investigate temporal variations of the fine structure constant a and the proton-to-electron mass ratio mu. We measure the frequency of the S-2(1/2) -> F-2(7/2) electric octupole (E3) transition in Yb-171(+) against two caesium fountain clocks as f(E3) = 642 121 496 772 645.36 Hz with an improved fractional uncertainty of 3.9 x 10(-16). This transition frequency shows a strong sensitivity to changes of alpha. Together with a number of previous and recent measurements of the S-2(1/2) -> D-2(3/2) electric quadrupole transition in Yb-171(+) and with data from other elements, a least-squares analysis yields (1/alpha)(d alpha/dt) = -0.20(20) x 10(-16)/yr and (1/mu)(d mu/dt) = -0.5(1.6) x 10(-16)/yr, confirming a previous limit on d alpha/dt and providing the most stringent limit on d mu/dt from laboratory experiments.