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Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia

Abstract : We report on our ongoing effort to measure the Boltzmann constant, k B , using the Doppler broadening technique on ammonia. This paper presents some of the improvements made to the mid-infrared spectrometer including the use of a phase-stabilized quantum cascade laser, a lineshape analysis based on a refined physical model and an improved fitting program 2 increasing the confidence in our estimates of the relevant molecular parameters, and a first evaluation of the saturation parameter and its impact on the measurement of k B. A summary of the systematic effects contributing to the measurement is given and the optimal experimental conditions for mitigating those effects in order to reach a competitive measurement of k B at a part per million accuracy level are outlined.
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https://hal.archives-ouvertes.fr/hal-01159864
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Submitted on : Wednesday, June 3, 2015 - 10:54:08 PM
Last modification on : Wednesday, September 28, 2022 - 5:56:22 AM
Long-term archiving on: : Tuesday, September 15, 2015 - 10:37:03 AM

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S Mejri, Papa Lat Tabara Sow, O Kozlova, C Ayari, Sean K. Tokunaga, et al.. Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia. Metrologia, IOP Publishing, 2015, 52, pp.S314-S323. ⟨10.1088/0026-1394/52/5/S314⟩. ⟨hal-01159864⟩

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