Frequency evaluation of the doubly forbidden $^1S_0\to ^3P_0$ transition in bosonic $^{174}$Yb

TL;DR

This paper evaluates the frequency and uncertainty of the $^1S_0 o ^3P_0$ transition in bosonic $^{174}$Yb, crucial for optical lattice clocks, achieving high precision through comparisons with standards.

Contribution

It provides a precise measurement of the $^{174}$Yb transition frequency and reduces systematic uncertainties to enhance optical clock accuracy.

Findings

Transition frequency: 518294025309217.8 Hz

Uncertainty less than 0.8 Hz

Fractional frequency uncertainty: 1.5×10⁻¹⁵

Abstract

We report an uncertainty evaluation of an optical lattice clock based on the $^1S_0\leftrightarrow^3P_0$ transition in the bosonic isotope $^{174}$Yb by use of magnetically induced spectroscopy. The absolute frequency of the $^1S_0\leftrightarrow^3P_0$ transition has been determined through comparisons with optical and microwave standards at NIST. The weighted mean of the evaluations is $\nu$($^{174}$Yb)=518 294 025 309 217.8(0.9) Hz. The uncertainty due to systematic effects has been reduced to less than 0.8 Hz, which represents $1.5\times10^{-15}$ in fractional frequency.