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Proceedings Paper

Measurement of the 87Rb ground-state hyperfine splitting in an atomic fountain
Author(s): S. Bize; Yvan Sortais; Marilde Terezinha Prado Santos; Cipriana Mandache; Andre Clairon; C. Salomon
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Paper Abstract

The new atomic Rb-Cs fountain should confirm the recent theoretical calculations relating to the collisions of rubidium atoms. According to this theory, the displacement of the frequency of clock due to the collisional shift was predicted to be 15 times lower for 87Rb than for 133Cs at equal density. Using Rb instead of Cs in a foundation standard may lead to an order of magnitude improvement in frequency stability together with an excellent accuracy. In this paper we describe the operation of a laser cooled 87 frequency standard and present a new measurement of the 87Rb ground state hyperfine frequency with a relative accuracy of 2.4 10-15 by comparison with a Cs fountain atomic standard. In order to measure this, first we determined the absolute frequency of the reference H-maser by comparison with the LPTFs Cs fountain. Second, we corrected the measured frequency to take into account different systematic shifts: magnetic field, black body, microwave leakage, collisions. The measured frequency is 6 834 682 610.904 333 Hz. This value differs form previously published values1,2 by about 2-3 Hz and is 104 times more accurate.

Paper Details

Date Published: 23 February 2000
PDF: 6 pages
Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); doi: 10.1117/12.378740
Show Author Affiliations
S. Bize, Observatoire de Paris (France)
Yvan Sortais, Observatoire de Paris (France)
Marilde Terezinha Prado Santos, Univ. de Sao Carlos (Brazil)
Cipriana Mandache, National Institute for Laser, Plasma and Radiation Physics (Romania)
Andre Clairon, Observatoire de Paris (France)
C. Salomon, Lab. Kastler Brossel (France)

Published in SPIE Proceedings Vol. 4068:
SIOEL '99: Sixth Symposium on Optoelectronics
Teodor Necsoiu; Maria Robu; Dan C. Dumitras, Editor(s)

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