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

We report on our ongoing effort to measure the Boltzmann constant, , 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 re...

Full description

Saved in:
Bibliographic Details
Published in:Metrologia 2015-10, Vol.52 (5), p.S314-S323
Main Authors: Mejri, S, Sow, P L T, Kozlova, O, Ayari, C, Tokunaga, S K, Chardonnet, C, Briaudeau, S, Darquié, B, Rohart, F, Daussy, C
Format: Article
Language:English
Subjects:
Ammonia
Atomic Physics
Boltzmann constant
Constants
Doppler effect
Fittings
fundamental constants
Impact analysis
Infrared radiation
Lasers
Mathematical models
Measurement
mid-infrared laser spectroscopy
molecular parameters
molecular spectroscopy
Optics
Physics
quantum cascade laser
Quantum Physics
Spectrometers
Spectrum analysis
Symbols
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report on our ongoing effort to measure the Boltzmann constant, , 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 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 . 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 at a part per million accuracy level are outlined.
ISSN:0026-1394
1681-7575
DOI:10.1088/0026-1394/52/5/S314