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Two-photon frequency comb spectroscopy of atomic hydrogen

2020; American Association for the Advancement of Science; Volume: 370; Issue: 6520 Linguagem: Inglês

10.1126/science.abc7776

1095-9203

Alexey Grinin, Arthur Matveev, D. C. Yost, Lothar Maisenbacher, Vitaly Wirthl, Randolf Pohl, Theodor W. Hänsch, Thomas Udem,

Spectroscopy and Laser Applications

We have performed two-photon ultraviolet direct frequency comb spectroscopy on the 1S-3S transition in atomic hydrogen to illuminate the so-called proton radius puzzle and to demonstrate the potential of this method. The proton radius puzzle is a significant discrepancy between data obtained with muonic hydrogen and regular atomic hydrogen that could not be explained within the framework of quantum electrodynamics. By combining our result [f1S-3S = 2,922,743,278,665.79(72) kilohertz] with a previous measurement of the 1S-2S transition frequency, we obtained new values for the Rydberg constant [R∞ = 10,973,731.568226(38) per meter] and the proton charge radius [rp = 0.8482(38) femtometers]. This result favors the muonic value over the world-average data as presented by the most recent published CODATA 2014 adjustment.