New Measurement of the 2S Hyperfine Interval in Atomic Hydrogen

Abstract

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 $D_{21}=8f_{\mathrm{HFS}}(2S)-f_{\mathrm{HFS}}(1S)=48953(3)$ Hz is in good agreement with the value of 48 923(54) Hz obtained from this experiment.

4 pages, 4 figures

References in corpus (3)

• Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
• Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
• Photoionization Broadening of the 1S-2S Transition in a Beam of Atomic Hydrogen

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