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Comptes Rendus Physique
Volume 10, n° 9
pages 907-915 (novembre 2009)
Doi : 10.1016/j.crhy.2009.10.011
Precise determination of the Doppler width of a rovibrational absorption line using a comb-locked diode laser
Détermination expérimentale de la largeur Doppler d’une raie d’absorption moléculaire rovibrationnelle en utilisant une diode laser asservie à l’aide d’un peigne de fréquences

Koichi M.T. Yamada a, , Atsushi Onae b , Feng-Lei Hong b , Hajime Inaba b , Tadao Shimizu b
a Institute for Environmental Management Technology (EMTech), AIST, Onogawa 16-1, Tsukuba 305-8569, Japan 
b National Metrology Institute of Japan (NMIJ), AIST, Umezono 1-1-1, Tsukuba 305-8563, Japan 

Corresponding author.

We had reported in a previous paper the precision measurement of line profiles of a transition of 13C acetylene in the near-infrared region, employing a tunable diode-laser spectrometer, the frequency of which is locked to an optical-comb signal [K.M.T. Yamada et al., J. Mol. Spectrosc. 249 (2008) 95–99]. In the present article we review the methodology for the experiment and the analysis in determining the Boltzmann constant from the Doppler width of a rovibrational transition on the basis of our experiences. Problems to be surmounted for further improvement in accuracy are discussed. To cite this article: K.M.T. Yamada et al., C. R. Physique 10 (2009).

The full text of this article is available in PDF format.

Dans un article précédent, nous avons publié les résultats obtenus pour l’observation du profil des raies d’une transition dans l’acétylène 13C dans le proche infrarouge. Ce travail a été effectué en utilisant un spectrométre à diode laser accordable, la fréquence du signal étant pilotée à l’aide d’un peigne de fréquences optiques [K.M.T. Yamada et al., J. Mol. Spectrosc. 249 (2008) 95–99]. Dans le présent article nous décrivons la méthode expérimentale employée et nous approfondissons l’analyse permettant de déduire de nos résultats une détermination de la constante de Boltzmann   à partir de la largeur Doppler observée. Nous discutons également les difficultés restant à surmonter pour améliorer l’exactitude de la mesure de  . Pour citer cet article : K.M.T. Yamada et al., C. R. Physique 10 (2009).

The full text of this article is available in PDF format.

Keywords : Boltzmann constant, Doppler width, Acetylene, Frequency comb, NIR

Mots-clés : Constante de Boltzmann, Largeur Doppler, Spectroscopie IR, Peigne de frequences, Acétylène

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