Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia
| Autor: | Papa Lat Tabara Sow, Sean Tokunaga, François Rohart, S. Mejri, C. Ayari, O. Kozlova, Benoît Darquié, S. Briaudeau, Christophe Daussy, Christian Chardonnet |
|---|---|
| Přispěvatelé: | MMTF, Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), Laboratoire commun de métrologie LNE-CNAM (LCM), Laboratoire National de Métrologie et d'Essais [Trappes] (LNE )-Conservatoire National des Arts et Métiers [CNAM] (CNAM), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), CNRS, AS GRAM, Région Nord–Pas de Calais, Ministère de l’Enseignement Supérieur et de la Recherche, ANR-12-ASTR-0028,QUIGARDE,Lasers à cascade quantiques émettant autour de 10 µm pour la détection à distance de composés gazeux(2012), ANR-10-LABX-0005,CheMISyst,CHEmistry of Molecular and Interfacial Systems(2010), ANR-10-LABX-0048,FIRST-TF,Network of Facilities for Innovation, Research, Services and Training in Time & Frequency(2010), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Atomic Physics (physics.atom-ph) Measure (physics) FOS: Physical sciences Metrology 01 natural sciences Fundamental constants Physics - Atomic Physics law.invention 010309 optics symbols.namesake [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] law 0103 physical sciences Laser spectroscopy 010306 general physics Spectroscopy Quantum Physics [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] Spectrometer [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph] General Engineering Molecular spectroscopy Computational physics Boltzmann constant symbols Quantum Physics (quant-ph) Quantum cascade laser Saturation (chemistry) Physics - Optics Optics (physics.optics) Doppler broadening |
| Zdroj: | Metrologia Metrologia, IOP Publishing, 2015, 52, pp.S314-S323. ⟨10.1088/0026-1394/52/5/S314⟩ Metrologia, 2015, 52, pp.S314-S323. ⟨10.1088/0026-1394/52/5/S314⟩ |
| ISSN: | 0026-1394 1681-7575 |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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