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Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia
- Source :
- Metrologia 52 (2015) S314-S323
- Publication Year :
- 2015
-
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.
- Subjects :
- Physics - Atomic Physics
Physics - Optics
Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Metrologia 52 (2015) S314-S323
- Publication Type :
- Report
- Accession number :
- edsarx.1506.01828
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/0026-1394/52/5/S314