New Measurement of the 2S Hyperfine Interval in Atomic Hydrogen

Details New Measurement of the 2S Hyperfine Interval in Atomic Hydrogen New Measurement of the 2S Hyperfine Interval in Atomic Hydrogen

2008-12-18

arxiv.org/abs/0812.3509v2

Phys. Rev. Lett. 102, 213002 (2009)

Physics

Atomic Physics

4 pages, 4 figures

Scientific paper

An optical measurement of the 2S hyperfine interval in atomic hydrogen using two-photon spectroscopy of the 1S-2S transition gives a value of 177 556 834.3(6.7) Hz. The uncertainty is 2.4 times smaller than achieved by our group in 2003 and more than 4 times smaller than for any independent radio-frequency measurement. The specific combination of the 2S and 1S hyperfine intervals predicted by QED theory $D_{21}=8 f_{\rm HFS}({2S}) - f_{\rm HFS}({1S})=48 953(3)$ Hz is in good agreement with the value of 48 923(54) Hz obtained from this experiment.

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