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We measured the absolute frequency of the optical clock transition 1S0 (F =1/2) - 3P0 (F = 1/2) of 171Yb atoms confined in a one-dimensional opticallattice and it was determined to be 518 295 836 590 863.5(8.1) Hz. Thefrequency was measured against Terrestrial Time (TT; the SI second on thegeoid) by using an optical frequency comb of which the frequency wasphase-locked to an H-maser as a flywheel oscillator traceable to TT. The magicwavelength was also measured as 394 798.48(79) GHz. The results are in goodagreement with two previous measurements of other institutes within thespecified uncertainty of this work.

Absolute frequency measurement of 1S0 (F = 1/2) - 3P0 (F = 1/2) transition of 171Yb atoms in a one-dimensional optical lattice at KRISS