Le Targat Rodolphe, Baillard Xavier, Fouché Mathilde, Brusch Anders, Tcherbakoff Olivier, Rovera Giovanni D, Lemonde Pierre
LNE-SYRTE, Observatoire de Paris 61, Avenue de l'Observatoire, 75014 Paris, France.
Phys Rev Lett. 2006 Sep 29;97(13):130801. doi: 10.1103/PhysRevLett.97.130801. Epub 2006 Sep 26.
We report a frequency measurement of the 1S0-3P0 transition of 87Sr atoms in an optical lattice clock. The frequency is determined to be 429 228 004 229 879(5) Hz with a fractional uncertainty that is comparable to state-of-the-art optical clocks with neutral atoms in free fall. The two previous measurements of this transition were found to disagree by about 2 x 10(-13), i.e., almost 4 times the combined error bar and 4 to 5 orders of magnitude larger than the claimed ultimate accuracy of this new type of clocks. Our measurement is in agreement with one of these two values and essentially resolves this discrepancy.
我们报告了在光晶格钟中对87Sr原子1S0-3P0跃迁的频率测量结果。所确定的频率为429228004229879(5)Hz，其分数不确定度与处于自由落体状态的中性原子的最先进光钟相当。此前对该跃迁的两次测量结果相差约2×10^(-13)，即几乎是合并误差线的4倍，且比这种新型时钟所宣称的最终精度大4至5个数量级。我们的测量结果与这两个值中的一个一致，基本解决了这一差异。
