The absolute frequency of the ¹⁷⁶Lu⁺ optical clock was measured against the NRC-FCs2 caesium fountain at 353,638,794,073,800.33(9) Hz with 2.6×10⁻¹⁶ fractional uncertainty.
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Absolute frequency measurement of the $^{176}$Lu$^+\,(^{3}\mathrm{D}_1)$ standard against the NRC-FCs2 fountain with $2.6\times10^{-16}$ uncertainty
The absolute frequency of the ¹⁷⁶Lu⁺ optical clock was measured against the NRC-FCs2 caesium fountain at 353,638,794,073,800.33(9) Hz with 2.6×10⁻¹⁶ fractional uncertainty.