Two-photon frequency comb spectroscopy of atomic hydrogen

Grinin, Alexey (2020): Two-photon frequency comb spectroscopy of atomic hydrogen. Dissertation, LMU München: Faculty of Physics

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.

• Item Type: Theses (Dissertation, LMU Munich)
• Keywords: Hydrogen spectroscopy, two-photon spectroscopy, frequency comb spectroscopy, frequency comb, proton radius puzzle, proton size puzzle, 1S-3S transition
• Subjects: 500 Natural sciences and mathematics; 500 Natural sciences and mathematics > 530 Physics
• Faculties: Faculty of Physics
• Language: English
• Date of oral examination: 18. August 2020
• 1. Referee: Hänsch, Theodor W.
• Signature of the printed copy: 0001/UMC 27533