Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 24, Pages 5496-5499Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.5496
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We report on an absolute frequency measurement of the hydrogen 1S-2S two-photon transition in a cold atomic beam with an accuracy of 1.8 parts in 10(14). Our experimental result of 2 466 061 413 187 103(46) Hz has been obtained by phase coherent comparison of the hydrogen transition frequency with an atomic cesium fountain clock. Both frequencies are linked with a comb of laser frequencies emitted by a mode locked laser.
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