Abstract
In this paper, the latest results on the measurement of the Boltzmann constant k B, by laser spectroscopy of ammonia at 10μm are presented. The Doppler absorption profile of a rovibrational line of an NH3 gas sample at thermal and pressure equilibrium is measured as accurately as possible. The absorption cell is placed inside a large 1 m3 thermostat filled with an ice–water mixture, which sets the temperature very close to 273.15 K. Analyzing this profile, which is related to the Maxwell–Boltzmann molecular speed distribution, leads to a determination of the Boltzmann constant via a measurement of the Doppler width (proportional to \({\sqrt{k_{\rm B} T})}\). A spectroscopic determination of the Boltzmann constant with an uncertainty as low as 37 ppm is obtained. Recent improvements with a new passive thermostat lead to a temperature accuracy, stability, and homogeneity of the absorption cell of 1 ppm over a day.
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Lemarchand, C., Djerroud, K., Darquié, B. et al. Determination of the Boltzmann Constant by Laser Spectroscopy as a Basis for Future Measurements of the Thermodynamic Temperature. Int J Thermophys 31, 1347–1359 (2010). https://doi.org/10.1007/s10765-010-0755-3
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DOI: https://doi.org/10.1007/s10765-010-0755-3