We report an uncertainty evaluation of an optical lattice clock based on the S-1(0) <-> P-3(0), transition in the bosonic isotope Yb-174 by use of magnetically induced spectroscopy. The absolute frequency of the S-1(0) <-> P-3(0) transition has been determined through comparisons with optical and microwave standards at NIST. The weighted mean of the evaluations is nu(Yb-174)=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 X 10(-15) in fractional frequency.
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