ar X iv : 0 90 6 . 12 19 v 2 [ ph ys ic s . at om - p h ] 2 5 Ju l 2 00 9 Spin - 1 / 2 Optical Lattice Clock
نویسنده
چکیده
We experimentally investigate an optical clock based on Yb (I = 1/2) atoms confined in an optical lattice. We have evaluated all known frequency shifts to the clock transition, including a densitydependent collision shift, with a fractional uncertainty of 3.4 × 10, limited principally by uncertainty in the blackbody radiation Stark shift. We measured the absolute clock transition frequency relative to the NIST-F1 Cs fountain clock and find the frequency to be 518 295 836 590 865.2(0.7) Hz.
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