The 3^{2}D_{5}/_{2} to 4^{2}S_{1}/_{2} g-factor ratio in ^{40}Ca^{+} is 0.5994888133(2) (Penning) and 0.599488813(6) (RF), a >40 imes uncertainty reduction that agrees across platforms.
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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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Dual-Platform Precision Measurement of the $3^2D_{5/2}$ to $4^2S_{1/2}$ $g$-Factor Ratio in $^{40}\text{Ca}^+$
The 3^{2}D_{5}/_{2} to 4^{2}S_{1}/_{2} g-factor ratio in ^{40}Ca^{+} is 0.5994888133(2) (Penning) and 0.599488813(6) (RF), a >40 imes uncertainty reduction that agrees across platforms.
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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.