Measurement of the hydrogen 1S-2S transition frequency by phase coherent comparison with a microwave cesium fountain clock

Authors
Niering, M Holzwarth, R Reichert, J Pokasov, P Udem, T Weitz, M Hansch, TW Lemonde, P Santarelli, G Abgrall, M Laurent, P Salomon, C Clairon, A
Citation
M. Niering et al., Measurement of the hydrogen 1S-2S transition frequency by phase coherent comparison with a microwave cesium fountain clock, PHYS REV L, 84(24), 2000, pp. 5496-5499
Citations number
24
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
24
Year of publication
2000
Pages
5496 - 5499
Database
ISI
SICI code
0031-9007(20000612)84:24<5496:MOTH1T>2.0.ZU;2-A
Abstract
We report on an absolute frequency measurement of the hydrogen 1S-2S two-ph oton transition in a cold atomic beam with an accuracy of 1.8 parts in 10(1 4). Our experimental result of 2 466 061 413 187 103(46) Hz has been obtain ed by phase coherent comparison of the hydrogen transition frequency with a n atomic cesium fountain clock. Both frequencies are linked with a comb of laser frequencies emitted by a mode locked laser.