Improved Measurement of the Hydrogen 1S - 2S Transition Frequency

Jul 15, 2011
5 pages
Published in:
  • Phys.Rev.Lett. 107 (2011) 203001
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Abstract: (arXiv)
We have measured the 1S - 2S transition frequency in atomic hydrogen via two photon spectroscopy on a 5.8 K atomic beam. We obtain f1S2S=2466061413187035(10)f_{1S-2S} = 2 466 061 413 187 035 (10) Hz for the hyperfine centroid. This is a fractional frequency uncertainty of 4.2×10154.2\times 10^{-15} improving the previous measure- ment by our own group [M. Fischer et al., Phys. Rev. Lett. 92, 230802 (2004)] by a factor of 3.3. The probe laser frequency was phase coherently linked to the mobile cesium fountain clock FOM via a frequency comb.
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  • 5 pages, 4 figures