First accuracy evaluation of NIST-F2

By Thomas Patrick Heavner, E. A. Donley, F. Levi, G. Costanzo, T. Parker, J. Shirley, N. Ashby, S. Barlow, Steven R. Jefferts. 2014

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State of the Field: Extreme Precision Radial Velocities (2016, background): “…of comparison, the Ramsey fringe of the cesium clock has a line width of about 1 Hz and a microwave oscillator can be locked to the central fringe with a precision of 10−13 in one second; and with averaging one can achieve a fractional measurement uncertainty of about 10−16 (Heavner et al. 2014).”
Search for New Physics with Atoms and Molecules (2017, background): “…this Cs frequency and no absolute frequency measurement can be performed with smaller fractional frequency uncertainty than that of the best Cs frequency standard, which is presently on the order of 10−16 (Guéna et al., 2012a, 2010; Heavner et al., 2014; Levi et al., 2014; Szymaniec et al., 2010).”