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Communication Dans Un Congrès Année : 2013

Accurate determination of the Boltzmann constant by Doppler spectroscopy: Towards a new definition of the kelvin

Résumé

Accurate molecular spectroscopy in the mid-infrared region allows precision measurements of fundamental constants. For instance, measuring the linewidth of an isolated Doppler-broadened absorption line of ammonia around 10 µm enables a determination of the Boltzmann constant k B. We report on our latest measurements. By fitting this lineshape to several models which include Dicke narrowing or speed-dependent collisional effects, we find that a determination of k B with an uncertainty of a few ppm is reachable. This is comparable to the best current uncertainty obtained using acoustic methods and would make a significant contribution to any new value of k B determined by the CODATA. Furthermore, having multiple independent measurements at these accuracies opens the possibility of defining the kelvin by fixing k B , an exciting prospect considering the upcoming redefinition of the International System of Units.
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hal-01165895 , version 1 (20-06-2015)

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Benoît Darquié, Sinda Mejri, Papa Lat Tabara Sow, Cyril Lemarchand, Meriam Triki, et al.. Accurate determination of the Boltzmann constant by Doppler spectroscopy: Towards a new definition of the kelvin. 23rd International Conference on Atomic Physics (ICAP 2012), Jul 2012, Palaiseau, France. pp.02005, ⟨10.1051/epjconf/20135702005⟩. ⟨hal-01165895⟩
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