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Elisabeth Peters, Dylan C. Yost, Arthur Matveev, Theodor W. Hänsch and Thomas Udem Frequency-comb spectroscopy of the hydrogen 1S-3S and 1S-3D transitions Annalen der Physik 525

Article first published online: 17 MAY 2013 | DOI: 10.1002/andp.201300062

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An observation of the 1S-3S and 1S-3D two-photon transition in an atomic hydrogen beam using direct frequency-comb spectroscopy in a Doppler-free arrangement is reported. The measurements of these transition frequencies may be used for an improved determination of the Rydberg constant and the 1S Lamb shift and could shed light on the current discrepancy in the determination of the proton charge radius.

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