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• W2116889615 abstract "In this article, we describe an experiment performed at the Laboratoire de physique des lasers and dedicated to an optical measurement of the Boltzmann constant kB. With the proposed innovative technique, determining kB comes down to an ordinary frequency measurement. The method consists in measuring as accurately as possible the Doppler absorption profile of a rovibrational line of ammonia in thermal equilibrium. This profile is related to the Maxwell–Boltzmann molecular velocity distribution along the laser beam. A fit of the absorption line shape leads to a determination of the Doppler width proportional to kBT and thus to a determination of the Boltzmann constant. The laser source is an ultra-stable CO2 laser with a wavelength λ≈10 μm. The absorption cell is placed in a thermostat, keeping the temperature at 273.15 K within 1.4 mK. We were able to measure kB with a relative uncertainty as small as 3.8×10−5, which represents an improvement of an order of magnitude for an integration time comparable to our previous measurement published in 2007. To cite this article: K. Djerroud et al., C. R. Physique 10 (2009). Dans cet article, nous présentons l'expérience développée au Laboratoire de physique des lasers pour la mesure optique de la constante de Boltzmann kB. Cette nouvelle approche ramène la détermination de kB à une mesure de fréquence. L'expérience consiste à mesurer le plus exactement possible le profil d'absorption Doppler d'une raie de vibration–rotation de l'ammoniac à l'équilibre thermodynamique. Ce profil reflète la distribution de Maxwell–Boltzmann des vitesses moléculaires le long du faisceau laser. Une analyse de la forme de la raie d'absorption conduit à une détermination de l'élargissement Doppler, proportionnel à kBT, et donc à une mesure de la constante de Boltzmann. La mesure spectroscopique est réalisée à l'aide d'un laser à CO2 ultra-stable de longueur d'onde λ≈10 μm. La cellule d'absorption est placée dans un thermostat qui permet de contrôler la température autour de 273,15 K avec une incertitude de 1,4 mK. Ces mesures nous ont conduit récemment à une détermination de kB avec une incertitude relative de 3,8×10−5. Cela représente, pour des temps de mesure comparables, un gain d'un ordre de grandeur par rapport à notre précédente mesure publiée en Daussy et al. (2007). Pour citer cet article : K. Djerroud et al., C. R. Physique 10 (2009)." @default.
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• W2116889615 date "2009-11-01" @default.
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• W2116889615 title "Measurement of the Boltzmann constant by the Doppler broadening technique at a accuracy level" @default.
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• W2116889615 doi "https://doi.org/10.1016/j.crhy.2009.10.020" @default.
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