2011
DOI: 10.1103/physrevlett.107.203001
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Improved Measurement of the Hydrogen1S2STransition Frequency

Abstract: 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 uncer… Show more

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Cited by 387 publications
(285 citation statements)
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“…In addition, the difference with the most accurately determined D 1S-2S experimental value (extracted from Refs. [13,25]; f D MPI ) is reduced to 0.82 ppb in comparison to 4.2 ppb in the ISIS measurement.…”
Section: S-2s Contributionsmentioning
confidence: 88%
“…In addition, the difference with the most accurately determined D 1S-2S experimental value (extracted from Refs. [13,25]; f D MPI ) is reduced to 0.82 ppb in comparison to 4.2 ppb in the ISIS measurement.…”
Section: S-2s Contributionsmentioning
confidence: 88%
“…The most recent result was reported by the Hänsch group in 2011, in which they determined the transition to a fractional frequency uncertainty of 4.2 × 10 −15 [10]. By that time, the UV laser source had evolved to an all solid state system that produced 13 mW of 243 nm cw radiation.…”
Section: Introductionmentioning
confidence: 84%
“…Very precise experiments correspond to the measurements of the spectroscopic properties of this atom. In particular, the frequency measurements of the two-photon transitions 2s-1s [1][2][3] and 3s-1s or 3d-1s [4,5] in hydrogen have established the highest order of accuracy for the spectroscopic experiments. On the other hand, the recent success in the production of antihydrogen atoms offers the possibility for a detailed comparison of spectroscopic properties of the H andH atoms.…”
Section: Introductionmentioning
confidence: 99%