Improved Measurement of the Hydrogen 1S2S Transition Frequency

Christian G. Parthey, Arthur Matveev, Janis Alnis, Birgitta Bernhardt, Axel Beyer, Ronald Holzwarth, Aliaksei Maistrou, Randolf Pohl, Katharina Predehl, Thomas Udem, Tobias Wilken, Nikolai Kolachevsky, Michel Abgrall, Daniele Rovera, Christophe Salomon, Philippe Laurent, and Theodor W. Hänsch
Phys. Rev. Lett. 107, 203001 – Published 11 November 2011

Abstract

We have measured the 1S2S transition frequency in atomic hydrogen via two-photon spectroscopy on a 5.8 K atomic beam. We obtain f1S2S=2466061413187035(10)   Hz for the hyperfine centroid, in agreement with, but 3.3 times better than the previous result [M. Fischer et al., Phys. Rev. Lett. 92, 230802 (2004)]. The improvement to a fractional frequency uncertainty of 4.2×1015 arises mainly from an improved stability of the spectroscopy laser, and a better determination of the main systematic uncertainties, namely, the second order Doppler and ac and dc Stark shifts. The probe laser frequency was phase coherently linked to the mobile cesium fountain clock FOM via a frequency comb.

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  • Received 15 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.203001

© 2011 American Physical Society

Authors & Affiliations

Christian G. Parthey1, Arthur Matveev1, Janis Alnis1, Birgitta Bernhardt1, Axel Beyer1, Ronald Holzwarth1,*, Aliaksei Maistrou1, Randolf Pohl1, Katharina Predehl1, Thomas Udem1, Tobias Wilken1, Nikolai Kolachevsky1,†, Michel Abgrall2, Daniele Rovera2, Christophe Salomon3, Philippe Laurent2, and Theodor W. Hänsch1,‡

  • 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
  • 2LNE-SYRTE, Observatoire de Paris, 61 avenue de l’Observatoire, 75014 Paris, France
  • 3Laboratoire Kastler-Brossel, CNRS, 24 rue Lhomond, 75231 Paris, France

  • *Also at Menlo Systems GmbH, Martinsried, Germany.
  • Also at P. N. Lebedev Physical Institute, Moscow, Russia. kolik@lebedev.ru
  • Also at Ludwig-Maximilians-University, Munich, Germany.

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Vol. 107, Iss. 20 — 11 November 2011

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