Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Guena, Jocelyne"'
Autor:
Fleurbaey, Hélène, Galtier, Sandrine, Thomas, Simon, Bonnaud, Marie, Julien, Lucile, Biraben, François, Nez, François, Abgrall, Michel, Guéna, Jocelyne
Publikováno v:
Phys. Rev. Lett. 120, 183001 (2018)
We present a new measurement of the $1S-3S$ two-photon transition frequency of hydrogen, realized with a continuous-wave excitation laser at 205 nm on a room-temperature atomic beam, with a relative uncertainty of $9\times10^{-13}$. The proton charge
Externí odkaz:
http://arxiv.org/abs/1801.08816
Optical to microwave clock frequency ratios with a nearly continuous strontium optical lattice clock
Autor:
Lodewyck, Jérôme, Bilicki, Sławomir, Bookjans, Eva, Robyr, Jean-Luc, Shi, Chunyan, Vallet, Grégoire, Targat, Rodolphe Le, Nicolodi, Daniele, Coq, Yann Le, Guéna, Jocelyne, Abgrall, Michel, Rosenbusch, Peter, Bize, Sébastien
Publikováno v:
Metrologia 53, 1123 (2016)
Optical lattice clocks are at the forefront of frequency metrology. Both the instability and systematic uncertainty of these clocks have been reported to be two orders of magnitude smaller than the best microwave clocks. For this reason, a redefiniti
Externí odkaz:
http://arxiv.org/abs/1605.03878
Publikováno v:
Metrologia 51, 108 (2014)
We report the first contribution to the international atomic time (TAI) based on a secondary representation of the SI second. This work is done with the LNE-SYRTE FO2-Rb fountain frequency standard using the $^{87}$Rb ground state hyperfine transitio
Externí odkaz:
http://arxiv.org/abs/1401.7976
Autor:
Guéna, Jocelyne, Abgrall, Michel, Rovera, Daniele, Rosenbusch, Peter, Tobar, Michael E., Laurent, Philippe, Clairon, André, Bize, Sébastien
Publikováno v:
Phys. Rev. Lett. 109, 080801 (2012)
We report tests of local position invariance based on measurements of the ratio of the ground state hyperfine frequencies of 133Cs and 87Rb in laser-cooled atomic fountain clocks. Measurements extending over 14 years set a stringent limit to a possib
Externí odkaz:
http://arxiv.org/abs/1205.4235
Autor:
Guéna, Jocelyne, Abgrall, Michel, Rovera, Daniele, Laurent, Philippe, Chupin, Baptiste, Lours, Michel, Santarelli, Giorgio, Rosenbusch, Peter, Tobar, Michael E., Li, Ruoxin, Gibble, Kurt, Clairon, André, Bize, Sébastien
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 59, pages 391-420 (2012)
We give an overview of the work done with the Laboratoire National de M\'etrologie et d'Essais-Syst\`emes de R\'ef\'erence Temps-Espace (LNE-SYRTE) fountain ensemble during the last five years. After a description of the clock ensemble, comprising th
Externí odkaz:
http://arxiv.org/abs/1204.3621
Publikováno v:
Phys. Rev. Lett. 106, 130801 (2011)
We demonstrate agreement between measurements and ab initio calculations of the frequency shifts caused by distributed cavity phase variations in the microwave cavity of a primary atomic fountain clock. Experimental verification of the finite element
Externí odkaz:
http://arxiv.org/abs/1103.1633
Publikováno v:
European Physical Journal Applied Physics, 388 (30/05/2007) 183-189
The short-term stability of passive atomic frequency standards, especially in pulsed operation, is often limited by local oscillator noise via intermodulation effects. We present an experimental demonstration of the intermodulation effect on the freq
Externí odkaz:
http://arxiv.org/abs/physics/0702164
Publikováno v:
European Physical Journal A 32, 4 (25/07/2007) 525-529
We present the atomic parity violation measurements made in Cs vapour using a pump-probe scheme. After pulsed excitation of the 6S-7S forbidden transition in the presence of a longitudinal electric field, a laser beam resonant with one of the 7S-6P t
Externí odkaz:
http://arxiv.org/abs/physics/0610035
Publikováno v:
Review of Scientific Instruments 76 (2005) 053108
We describe the implementation of a cylindrical T-shaped alkali-vapor cell for laser spectroscopy in the presence of a longitudinal electric field. The two windows are used as two electrodes of the high-voltage assembly, which is made possible by a m
Externí odkaz:
http://arxiv.org/abs/physics/0504020
Publikováno v:
Mod.Phys.Lett. A20 (2005) 375-390
We review the progress made in the determination of the weak charge, Q\_w, of the cesium nucleus which raises the status of Atomic Parity Violation measurements to that of a precision electroweak test. Not only is it necessary to have a precision mea
Externí odkaz:
http://arxiv.org/abs/physics/0503143