We show in this paper that requantized classical molecular dynamics simulations (rCMDSs) are capable of predicting various refined spectral-shape parameters of absorption lines of CO2 broadened by N2 with high precision. Combining CMDSs and a requantization procedure, we computed the auto-correlation function of the CO2 dipole moment responsible for the absorption transition. Its Fourier-Laplace transform directly yields the spectrum. Calculations were made for two temperatures, 200 and 296 K, at 1 atm and for a large range of Doppler widths, from the near-Doppler to the collision-dominant regimes. For each temperature and each line, the spectra calculated for various Doppler widths were simultaneously fit with the Hartmann-Tran (HT) profile. This refined profile, which takes into account the effects of the speed dependent collisional line broadening, the Dicke narrowing, and the collisional line mixing, was recommended as a reference model to be used in high-resolution spectroscopy (instead of the simplified Voigt model). The HT parameters retrieved from the rCMDS-calculated spectra were then directly compared with those deduced from high-precision measurements [J. S. Wilzewski et al., J. Quant. Spectrosc. Radiat. Transfer 206, 296–305 (2018)]. The results show a very good agreement, even for those parameters whose influence on the spectra is very small. Good agreement is also obtained between measured and predicted temperature dependences of these parameters. This demonstrates that rCMDS is an excellent tool, highly competitive with respect to high quality measurements for precise line-shape studies.
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14 December 2018
Research Article|
December 11 2018
Prediction of line shape parameters and their temperature dependences for CO2–N2 using molecular dynamics simulations
H. T. Nguyen;
H. T. Nguyen
1
Faculty of Physics, Hanoi National University of Education
, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
2
Laboratoire de Météorologie Dynamique, IPSL, CNRS, Sorbonne Université, École normale supérieure, PSL Research University, École Polytechnique
, F-75005 Paris, France
3
REMOSAT, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST)
, Hanoi, Vietnam
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N. H. Ngo;
N. H. Ngo
a)
1
Faculty of Physics, Hanoi National University of Education
, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
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J. Chem. Phys. 149, 224301 (2018)
Article history
Received:
October 02 2018
Accepted:
November 19 2018
Citation
H. T. Nguyen, N. H. Ngo, H. Tran; Prediction of line shape parameters and their temperature dependences for CO2–N2 using molecular dynamics simulations. J. Chem. Phys. 14 December 2018; 149 (22): 224301. https://doi.org/10.1063/1.5063892
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