Measurement of the 1S-2S frequency in atomic hydrogen

E. A. Hildum, U. Boesl, D. H. McIntyre, R. G. Beausoleil, T. W. Hansch

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We report on a first precise measurement of the 1S-2S energy interval in atomic hydrogen. Observing the 1S-2S transition in an atomic beam by pulsed Doppler-free two-photon spectroscopy and using an interferometrically calibrated absorption line of Te2130 at 486 nm as the reference, we measure the frequency f(1S-2S)=2 466 061 395.6(4.8) MHz. Using the calculated 1S Lamb shift, we obtain a value for the Rydberg constant, R=109 737.314 92(22) cm-1, which is not in good agreement with the most recent previous measurement.

Original languageEnglish
Pages (from-to)576-579
Number of pages4
JournalPhysical Review Letters
Issue number6
StatePublished - 1986
Externally publishedYes


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