Precision measurement of the hydrogen-deuterium 1S-2S isotope shift

Christian G. Parthey, Arthur Matveev, Janis Alnis, Randolf Pohl, Thomas Udem, Ulrich D. Jentschura, Nikolai Kolachevsky, Theodor W. Hänsch

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Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of the 1S-2S transition, we obtain 670994334606(15) Hz. This is a 10-times improvement over the previous best measurement confirming its frequency value. A calculation of the difference of the mean square charge radii of deuterium and hydrogen results in r2d-r2 p=3.82007(65)fm2, a more than twofold improvement compared to the former value.

Original languageEnglish
Article number233001
JournalPhysical review letters
Issue number23
Publication statusPublished - Jun 7 2010


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Parthey, C. G., Matveev, A., Alnis, J., Pohl, R., Udem, T., Jentschura, U. D., Kolachevsky, N., & Hänsch, T. W. (2010). Precision measurement of the hydrogen-deuterium 1S-2S isotope shift. Physical review letters, 104(23), [233001].