BNM-SYRTE fountains : recent results

C. Vian, P. Rosenbusch, H. Marion, S. Bize, L. Cacciapuoti, S. Zhang, M. Abgrall, D. Chambon, I. Maksimovic, P. Laurent, G. Santarelli, A. Clairon, Andre Luiten, Michael Tobar, C. Salomon

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)


Recent improvements of Bureau National de Metrologie Systemes de Reference Temps Espace (BNM-SYRTE) fountains FO1 and FO2 are described. Fractional frequency instabilities of 2.9 X 10(-14)τ(-1/2) for FO1 and 1.6 x 10(-14)τ(-1/2) for FO2 have been demonstrated. A preliminary estimate of the systematic frequency shifts gives an uncertainty of +/- 7.2 x 10(-16) for FO1 and +/- 6.5 x 10(-16) for FO2. Furthermore, we present a direct comparison between the two fountains. When a real-time measurement of the collisional shift is included, we observe a stability of the comparison of 5.0 x 10(-14)τ(-1/2) and a frequency difference of δ = 4 x 10(-16), well within the combined uncertainties.
Original languageEnglish
Pages (from-to)833-836
JournalIEEE Transactions on Instrumentation and Measurement
Issue number2
Publication statusPublished - 2005


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