Volume 45, Number 5, March I 1999
|Page(s)||558 - 564|
|Published online||01 September 2002|
High-accuracy measurement of the ground-state hyperfine splitting in an atomic fountain
BNM-LPTF, Observatoire de Paris - 61 Av. Denfert-Rochereau,
75014 Paris, France
2 Instituto de Física de São Carlos-USP, Departamento de Fisica e Ciência dos Materiais P.O. Box 369, Av. Dr. Carlos Botelho, 1465, São Carlos, SP, 13560-970, Brazil
3 Institutul National de Fizica Laserilor, Plasmei si Radiatiei P.O. Box-MG36, Bucuresti, Magurele, Romania
4 Laboratoire Kastler Brossel, Ecole Normale Supérieure 24 rue Lhomond, F-75231 Paris Cedex 05, France
Accepted: 21 December 1998
We describe the operation of a laser-cooled rubidium 87Rb frequency standard. We present a new measurement of the 87Rb hyperfine frequency with a relative accuracy, by comparison with a Cs fountain primary standard. The measured 87Rb ground-state hyperfine splitting is Hz. This value differs from previously published values (see Essen L., Hope E. G. and Sutcliffe D. ,Nature 189 1961 298; Penselin S., Moran T., Cohen W. and Wscinkler G., Phys. Rev., 127 1962 524; Arditi M. and Cerez P. IEEE Trans. Instrum. Meas. IM-21 1972 391) by about Hz and is 104 times more accurate. Because of the low collisional shift in 87Rb, future improvements may lead to a stability of and a relative accuracy in the 10-17 range.
PACS: 06.30.Ft – Time and frequency / 32.80.Pj – Optical cooling of atoms; trapping / 32.10.Fn – Fine and hyperfine structure
© EDP Sciences, 1999
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