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Phys Rev Lett. 2003 Nov 28;91(22):223001. Epub 2003 Nov 25.

Spectroscopy of the 1S0-3P0 clock transition of 87Sr in an optical lattice.

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Engineering Research Institute, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.


We report on the spectroscopy of the 5s(2) 1S0(F=9/2)-->5s5p 3P0(F=9/2) clock transition of 87Sr atoms (natural linewidth of 1 mHz) trapped in a one-dimensional optical lattice. Recoilless transitions with a linewidth of 0.7 kHz as well as the vibrational structure of the lattice potential were observed. By investigating the wavelength dependence of the carrier linewidth, we determined the magic wavelength, where the light shift in the clock transition vanishes, to be 813.5+/-0.9 nm.

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