New Measurement of the 1S−3S Transition Frequency of Hydrogen: Contribution to the Proton Charge Radius Puzzle

2018/01/31 by Hélène Fleurbaey, Sandrine Galtier, S. Thomas +10 · 257 citations
Chemistry · Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic and Molecular Physics #Computer science #Molecular Spectroscopy and Structure #physics.atom-ph

paper · pdf · doi:10.1103/physrevlett.120.183001

published in Physical Review Letters 120(18), 183001 (American Physical Society) · 5 pages, 4 figures, accepted for publication by Phys. Rev. Lett

openalex created_date 2018/02/02 · arxiv created 2018/04/27 · openalex publication_date 2018/05/04 · arxiv updated 2018/05/07 · openalex updated_date 2026/08/05

Abstract

We present a new measurement of the 1S-3S two-photon transition frequency of hydrogen, realized with a continuous-wave excitation laser at 205 nm on a room-temperature atomic beam, with a relative uncertainty of 9×10^-13. The proton charge radius deduced from this measurement, r_p=0.877(13) fm, is in very good agreement with the current CODATA-recommended value. This result contributes to the ongoing search to solve the proton charge radius puzzle, which arose from a discrepancy between the CODATA value and a more precise determination of r_p from muonic hydrogen spectroscopy.

Citations

• Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen
• The size of the proton
• The Proton Radius Puzzle
• Improved Measurement of the Hydrogen1S–2STransition Frequency
• CODATA recommended values of the fundamental physical constants: 2014

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