Measurement of the Hydrogen 1S- 2S Transition Frequency by Phase Coherent Comparison with a Microwave Cesium Fountain Clock

Details Measurement of the Hydrogen 1S- 2S Transition Frequency by Phase Coherent Comparison with a Microwave Cesium Fountain Clock Measurement of the Hydrogen 1S- 2S Transition Frequency by Phase Coherent Comparison with a Microwave Cesium Fountain Clock

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrvl..84.5496n&link_type=abstract

Physical Review Letters, Volume 84, Issue 24, June 12, 2000, pp.5496-5499

Physics

251

Scientific paper

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 1014. 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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