Absolute frequency measurement of the optical clock transition in with an uncertainty of using a frequency link to international atomic time
Absolute frequency measurement of the optical clock transition in with an uncertainty of using a frequency link to international atomic time
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DOI：
10.1080/09500340.2017.1384514
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发表时间：
2017-07
影响因子：
1.3
通讯作者：
C. Baynham;R. Godun;Jonathan M. Jones;S. King;P. Nisbet-Jones;F. Baynes;A. Rolland;P. Baird;K. Bongs;P. Gill;H. Margolis
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文献类型：
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作者：
C. Baynham;R. Godun;Jonathan M. Jones;S. King;P. Nisbet-Jones;F. Baynes;A. Rolland;P. Baird;K. Bongs;P. Gill;H. Margolis
高禁戒电八极跃迁是重新定义SI秒的一个潜在候选者。我们提出了一个测量的绝对频率的光学过渡，使用频率链接到国际原子时提供可追溯性SI秒。光频标工作时间为25天的76%，测得的绝对频率为642 121 496 772 645.14（26）Hz。的分数不确定度是可比的最好的先前报道的测量，这是由一个直接比较当地铯主频率标准。
Abstract The highly forbidden electric octupole transition in is a potential candidate for a redefinition of the SI second. We present a measurement of the absolute frequency of this optical transition, performed using a frequency link to International Atomic Time to provide traceability to the SI second. The optical frequency standard was operated for 76% of a 25-day period, with the absolute frequency measured to be 642 121 496 772 645.14(26) Hz. The fractional uncertainty of is comparable to that of the best previously reported measurement, which was made by a direct comparison to local caesium primary frequency standards.