Measurement of the Hydrogen-Transition Frequency by Phase Coherent Comparison with a Microwave Cesium Fountain Clock
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- 12 June 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 84 (24), 5496-5499
- https://doi.org/10.1103/physrevlett.84.5496
Abstract
We report on an absolute frequency measurement of the hydrogen two-photon transition in a cold atomic beam with an accuracy of 1.8 parts in . 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.
Keywords
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