Direct excitation of the forbidden clock transition in neutral 174Yb atoms confined to an optical lattice.

@article{Barber2006DirectEO,
  title={Direct excitation of the forbidden clock transition in neutral 174Yb atoms confined to an optical lattice.},
  author={Zeb W. Barber and Chad W. Hoyt and Christopher W. Oates and Leo Hollberg and Alexey V. Taichenachev and Valeriy I. Yudin},
  journal={Physical review letters},
  year={2006},
  volume={96 8},
  pages={
          083002
        }
}
We report direct single-laser excitation of the strictly forbidden (6s2)1S0 <--> (6s6p)3P0 clock transition in 174Yb atoms confined to a 1D optical lattice. A small (approximately 1.2 mT) static magnetic field was used to induce a nonzero electric dipole transition probability between the clock states at 578.42 nm. Narrow resonance linewidths of 20 Hz (FWHM) with high contrast were observed, demonstrating a resonance quality factor of 2.6 x 10(13). The previously unknown ac Stark shift… 

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