MEASUREMENT OF N2-COLLISIONAL SHIFT COEFFICIENTS OF METHANE LINES IN THE ν3 BAND AT HIGH TEMPERATURES

Bastien Vispoel, Nicolas Hespel, Claude Populaire, Muriel Lepère

Résultats de recherche: Contribution à un événement scientifique (non publié)Poster

Résumé

The study of the spectral parameters, and their variations with temperature and pressure, of methane lines is important for the remote sensing of atmospheres [1]. Methane is a minor component of the terrestrial atmosphere and his impact is important (methane is the third most abundant greenhouse gas [2]). Furthermore, methane is also present in the atmosphere of others planets [3-5] and stellar objects [6,7].

 

In this work, the collisional shift of absorption lines in the ν3 band of methane has been measured for several high temperatures (up to 600 K). This study has been made with a two-beams tunable diode-laser spectrometer.

 

The collisional line shift has been determined using a procedure described elsewhere [8]. So far we know, there is not a general law for the temperature dependence of the collisional line shift commonly used in the literature [9]. Knowing that, different laws have been tested to determine the temperature dependence of the line shift. The observations will be discussed.



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[2]   D.J. Wuebbles, K. Hayhoe, Earth-Science Reviews 57, 177-210 (2002)

[3]   E. Karkoschka, M.G. Tomasko, Icarus 211, 780-797 (2011)

[4]   E. Karkoschka, M. Tomasko, Icarus 202, 287-309 (2009)

[5]   I. de Pater, J.J. Lissauer, Planetary Sciences. Cambridge university press, Second Edition (2011)

[6]   V. Boudon, J.-P. Champion, T. Gabard, M. Loëte, A. Coustenis, C. De Bergh, B. Bézard, E. Lellouche, P. Drossart, M. Hirtig, A. Negrão, and C.A. Griffith, Société Française de Physique – Sciences de la Matière et Technologies, Société française de physique 11, 13-16 (2008)

[7]   E.L. Gibb, M.J. Mumma, N. Dello Russo, M.A. DiSanti, K. Magee-Sauer, Icarus 165, 391-406 (2003)

[8]   B. Vispoel, M. Dhyne, J.-C. Populaire, G. Blanquet, M. Lepère, J. of Mol. Spectrosc. 298, 7-10 (2014)

[9]   R.R. Gamache, J. Lamouroux, V. Blot-Lafon, E. Lopes, J. Quant. Spectrosc. and Radiat. Transfer 135, 30-43 (2014)

langue originaleAnglais
Etat de la publicationPublié - 2 sept. 2014
EvénementThe 23rd International Conference on High Resolution Molecular Spectroscopy - Bologne, Italie
Durée: 2 sept. 20146 sept. 2014

Une conférence

Une conférenceThe 23rd International Conference on High Resolution Molecular Spectroscopy
PaysItalie
La villeBologne
période2/09/146/09/14

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