Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.
Phys Rev Lett. 2012 Dec 28;109(26):263004. doi: 10.1103/PhysRevLett.109.263004. Epub 2012 Dec 27.
We have determined the frequency shift that blackbody radiation is inducing on the 5s2 (1)S0-5s5p (3)P0 clock transition in strontium. Previously its uncertainty limited the uncertainty of strontium lattice clocks to 1×10(-16). Now the uncertainty associated with the blackbody radiation shift correction translates to a 5×10(-18) relative frequency uncertainty at room temperature. Our evaluation is based on a measurement of the differential dc polarizability of the two clock states and on a modeling of the dynamic contribution using this value and experimental data for other atomic properties.
我们已经确定了黑体辐射在锶的 5s2(1)S0-5s5p(3)P0 钟跃迁中引起的频移。此前，其不确定度将锶晶格钟的不确定度限制在 1×10(-16)。现在，与黑体辐射频移修正相关的不确定度在室温下转化为 5×10(-18)的相对频率不确定度。我们的评估是基于对两个钟态的直流极化率的测量以及使用该值和其他原子性质的实验数据对动态贡献进行建模。
