An optical lattice clock with spin-polarized 87Sr atoms
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We present a new evaluation of an 87Sr optical lattice clock using spin polarized atoms. The frequency of the 1S0→3P0 clock transition is found to be 429 228 004 229 873.6 Hz with a fractional uncertainty of 2.6×10-15, a value that is comparable to the frequency difference between the various primary standards throughout the world. This measurement is in excellent agreement with a previous one of similar accuracy [Phys. Rev. Lett. 98, 083002 (2007)].
PACS.06.30.Ft Time and frequency 37.10.Jk Atoms in optical lattices 32.60.+i Zeeman and Stark effects 32.30.Jc Visible and ultraviolet spectra
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