Deuteron charge radius and Rydberg constant from spectroscopy data in atomic deuterium

Randolf Pohl, Fraņois Nez, Thomas Udem, Aldo Antognini, Axel Beyer, Hélène Fleurbaey, Alexey Grinin, Theodor W. Hänsch, Lucile Julien, Franz Kottmann, Julian J. Krauth, Lothar Maisenbacher, Arthur Matveev, Fraņois Biraben

Research output: Contribution to JournalArticleAcademicpeer-review


We give a pedagogical description of the method to extract the charge radii and Rydberg constant from laser spectroscopy in regular hydrogen (H) and deuterium (D) atoms, that is part of the CODATA least-squares adjustment (LSA) of the fundamental physical constants. We give a deuteron charge radius rd from D spectroscopy alone of 2.1415(45) fm. This value is independent of the measurements that lead to the proton charge radius, and five times more accurate than the value found in the CODATA Adjustment 10. The improvement is due to the use of a value for the 1S→2S transition in atomic deuterium which can be inferred from published data or found in a PhD thesis.

Original languageEnglish
Pages (from-to)L1-L10
Issue number2
Publication statusPublished - 2 Mar 2017


  • deuteron radius
  • proton radius
  • Rydberg constant


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