Measurement of the 87Rb ground-state hyperfine splitting in an atomic fountain

S. Bize; Yvan Sortais; Marilde Terezinha Prado Santos; Cipriana Mandache; Andre Clairon; C. Salomon

doi:10.1117/12.378740

23 February 2000 Measurement of the ⁸⁷Rb ground-state hyperfine splitting in an atomic fountain

S. Bize, Yvan Sortais, Marilde Terezinha Prado Santos, Cipriana Mandache, Andre Clairon, C. Salomon

Proceedings Volume 4068, SIOEL '99: Sixth Symposium on Optoelectronics; (2000) https://doi.org/10.1117/12.378740
Event: SIOEL: Sixth Symposium of Optoelectronics, 1999, Bucharest, Romania

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 values^1,2 by about 2-3 Hz and is 10⁴ times more accurate.

Citation Download Citation

S. Bize, Yvan Sortais, Marilde Terezinha Prado Santos, Cipriana Mandache, Andre Clairon, and C. Salomon "Measurement of the ⁸⁷Rb ground-state hyperfine splitting in an atomic fountain", Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); https://doi.org/10.1117/12.378740

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