Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.
Phys Rev Lett. 2012 Dec 7;109(23):230802. doi: 10.1103/PhysRevLett.109.230802. Epub 2012 Dec 5.
We evaluated the C(6) coefficients of Yb-Yb, Yb-alkali, and Yb-group II van der Waals interactions with 2% uncertainty. The only existing experimental result for such quantities is for the Yb-Yb dimer. Our value, C(6)=1929(39) a.u., is in excellent agreement with the recent experimental determination of 1932(35) a.u. We have also developed a new approach for the calculation of the dynamic correction to the blackbody radiation shift. We have calculated this quantity for the Yb 6s(2) (1)S(0)-6s6p (3)P(0)(o) clock transition with 3.5% uncertainty. This reduces the fractional uncertainty due to the blackbody radiation shift in the Yb optical clock at 300 K to the 10(-18) level.
我们评估了 Yb-Yb、Yb-碱金属和 Yb 族 II 范德华相互作用的 C(6)系数，不确定度为 2%。此类量的唯一现有实验结果是 Yb-Yb 二聚体的实验结果。我们的值 C(6)=1929(39) 埃与最近实验确定的 1932(35) 埃非常吻合。我们还开发了一种计算黑体辐射位移动态修正的新方法。我们以 3.5%的不确定度计算了 Yb 6s(2) (1)S(0)-6s6p (3)P(0)(o)钟跃迁的这个量。这将 300 K 下 Yb 光学钟因黑体辐射位移引起的分数不确定度降低到 10(-18) 水平。
