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

摘要

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 useof magnetically induced spectroscopy. The absolute frequency of the$^1S_0\leftrightarrow^3P_0$ transition has been determined through comparisonswith optical and microwave standards at NIST. The weighted mean of theevaluations is $\nu$($^{174}$Yb)=518 294 025 309 217.8(0.9) Hz. The uncertaintydue to systematic effects has been reduced to less than 0.8 Hz, whichrepresents $1.5\times10^{-15}$ in fractional frequency.