We present a theoretical study of the effects of collisions with water vapor molecules on the absorption, around 4 μm, in both the high frequency wing of the CO2 ν3 band and the collision-induced fundamental band of N2. Calculations are made for the very first time, showing that predictions based on classical molecular dynamics simulations enable, without adjustment of any parameter, very satisfactory agreement with the few available experimental determinations. This opens the route for a future study in which accurate temperature-dependent (semi-empirical) models will be built and checked through comparisons between computed and measured atmospheric spectra. This is of interest since, as demonstrated by simulations, neglecting the humidity of air can lead to significant modifications of the atmospheric transmission (and thus also emission) between 2000 and 2800 cm−1.
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7 February 2018
Research Article|
February 06 2018
Effect of humidity on the absorption continua of CO2 and N2 near 4 μm: Calculations, comparisons with measurements, and consequences for atmospheric spectra
Jean-Michel Hartmann;
Jean-Michel Hartmann
a)
1
Laboratoire de Météorologie Dynamique/IPSL, CNRS, Ecole Polytechnique, Université Paris-Saclay
, 91128 Palaiseau, France
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Christian Boulet
;
Christian Boulet
2
Institut des Sciences Moléculaires d’Orsay, CNRS, Université Paris-Sud, Université Paris-Saclay
, Orsay F-91405, France
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Duc Dung Tran;
Duc Dung Tran
3
Laboratoire de Météorologie Dynamique, IPSL, UPMC Univ. Paris 06, Ecole Polytechnique, Ecole Normale Supérieure, Sorbonne Universités, Université Paris-Saclay, PSL Research University, CNRS
, 4 Place Jussieu, 75005 Paris, France
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Ha Tran
;
Ha Tran
3
Laboratoire de Météorologie Dynamique, IPSL, UPMC Univ. Paris 06, Ecole Polytechnique, Ecole Normale Supérieure, Sorbonne Universités, Université Paris-Saclay, PSL Research University, CNRS
, 4 Place Jussieu, 75005 Paris, France
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Yury Baranov
Yury Baranov
4
SPA “Typhoon,” Institute of Experimental Meteorology
, 4 Pobeda St., Obninsk, Kaluga Region 249034, Russia
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a)
Author to whom correspondence should be addressed: jean-michel.hartmann@lmd.polytechnique.fr
J. Chem. Phys. 148, 054304 (2018)
Article history
Received:
December 19 2017
Accepted:
January 18 2018
Citation
Jean-Michel Hartmann, Christian Boulet, Duc Dung Tran, Ha Tran, Yury Baranov; Effect of humidity on the absorption continua of CO2 and N2 near 4 μm: Calculations, comparisons with measurements, and consequences for atmospheric spectra. J. Chem. Phys. 7 February 2018; 148 (5): 054304. https://doi.org/10.1063/1.5019994
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