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Improved measurement of the hydrogen 1S-2S transition frequency. 2011
Christian G Parthey, and
Arthur Matveev, and
Janis Alnis, and
Birgitta Bernhardt, and
Axel Beyer, and
Ronald Holzwarth, and
Aliaksei Maistrou, and
Randolf Pohl, and
Katharina Predehl, and
Thomas Udem, and
Tobias Wilken, and
Nikolai Kolachevsky, and
Michel Abgrall, and
Daniele Rovera, and
Christophe Salomon, and
Philippe Laurent, and
Theodor W Hänsch
Max-Planck-Institut für Quantenoptik, Garching, Germany.
We have measured the 1S-2S transition frequency in atomic hydrogen via two-photon spectroscopy on a 5.8 K atomic beam. We obtain f(1S-2S) = 2,466,061,413,187,035 (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 × 10(-15) 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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