Title :

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

Author(s) :

Mejri, S [Auteur]
Sow, Papa [Auteur]
Kozlova, O [Auteur]
Laboratoire commun de métrologie LNE-CNAM [LCM-CNAM]
Ayari, C [Auteur]
Tokunaga, Sean [Auteur]
Chardonnet, C [Auteur]
Briaudeau, Stéphan [Auteur]
Laboratoire commun de métrologie LNE-CNAM [LCM-CNAM]
Darquié, B [Auteur]
Rohart, F [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Daussy, C [Auteur]

Journal title :

Metrologia

Pages :

S314-S323

Publisher :

IOP Publishing

Publication date :

2015-08-19

ISSN :

0026-1394

English keyword(s) :

Molecular spectroscopy
Fundamental constants
Metrology
Laser spectroscopy

HAL domain(s) :

Physique [physics]/Physique [physics]/Physique Atomique [physics.atom-ph]
Physique [physics]/Physique [physics]/Optique [physics.optics]
Physique [physics]/Physique Quantique [quant-ph]

English abstract : [en]

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 ...
Show more >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.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Lasers à cascade quantiques émettant autour de 10 µm pour la détection à distance de composés gazeux
CHEmistry of Molecular and Interfacial Systems
Network of Facilities for Innovation, Research, Services and Training in Time & Frequency

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL