Oscillations de Bloch d'atomes ultrafroids et mesure de la constante de structure fine

Abstract : From a measurement of the recoil velocity of an atom absorbing a photon, it is possible to deduce a determination of the ratio h/m between the Planck constant and the mass of the atoms and then to deduce a value of the fine structure constant alpha. To do this measurement, we use the technic of Bloch oscillations, which allows us to transfer a large number of recoils to the atoms. A velocity sensor, based on velocity selective Raman transition, allows us to measure the momentum transferred to the atoms. A measurement with a statistical uncertainty of 4.4 ppb, in conjunction with a careful study of systematic effects (5 ppb), lead us to a determination of alpha with an uncertainty of 6.7 ppb. This uncertainty is similar to the uncertainty of the best determinations of alpha based on atom interferometry.
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Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français


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Submitted on : Monday, October 24, 2005 - 2:07:45 PM
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Pierre Cladé. Oscillations de Bloch d'atomes ultrafroids et mesure de la constante de structure fine. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français. <tel-00010730>

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