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Two-photon frequency comb spectroscopy of atomic hydrogen
Two-photon frequency comb spectroscopy of atomic hydrogen
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 former 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. Combining our result f1S-3S = 2 922 743 278 665.79(72) kHz with a previous measurement of the 1S-2S transition frequency, we obtain new values for the Rydberg constant R_{infty} = 10 973 731.568 226(38) m^-1 and the proton charge radius r_{p} = 0.8482(38) fm. This result favors the muonic value over the world-average data as used in the most recent published CODATA 2014 adjustment.
Hydrogen spectroscopy, two-photon spectroscopy, frequency comb spectroscopy, frequency comb, proton radius puzzle, proton size puzzle, 1S-3S transition
Grinin, Alexey
2020
English
Universitätsbibliothek der Ludwig-Maximilians-Universität München
Grinin, Alexey (2020): Two-photon frequency comb spectroscopy of atomic hydrogen. Dissertation, LMU München: Faculty of Physics
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Abstract

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 former 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. Combining our result f1S-3S = 2 922 743 278 665.79(72) kHz with a previous measurement of the 1S-2S transition frequency, we obtain new values for the Rydberg constant R_{infty} = 10 973 731.568 226(38) m^-1 and the proton charge radius r_{p} = 0.8482(38) fm. This result favors the muonic value over the world-average data as used in the most recent published CODATA 2014 adjustment.