Title :

Self and N2 broadening coefficients of H2S probed by submillimeter spectroscopy: Comparison with IR measurements and semi-classical calculations

Author(s) :

Mouelhi, Meriem [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Cuisset, A. [Auteur correspondant]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Jellali, C. [Auteur]
Galalou, S. [Auteur]
Aroui, H. [Auteur]
Bocquet, Robin [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Mouret, Gaël [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Rohart, F. [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Physique Moléculaire aux Interfaces [PMI]
Hindle, Francis [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]

Journal title :

Journal of Quantitative Spectroscopy and Radiative Transfer

Pages :

106955

Publisher :

Elsevier

Publication date :

2020-05

ISSN :

0022-4073

English keyword(s) :

Semi-classical calculation
Rotational dependencies
Broadening coefficients
H2S
Submillimeter-wave spectroscopy
Speed-dependence effects

HAL domain(s) :

Physique [physics]

English abstract : [en]

High-resolution lines of H2S self-perturbed and perturbed by N2 have been recorded at room temperature using a frequency modulated THz spectrometer at pressures of H2S ranging from 0.1 to 1.0 mbar. A non-linear least squares ...
Show more >High-resolution lines of H2S self-perturbed and perturbed by N2 have been recorded at room temperature using a frequency modulated THz spectrometer at pressures of H2S ranging from 0.1 to 1.0 mbar. A non-linear least squares fitting of these spectra has been performed to retrieve self- and N2-broadening coefficients of pure rotational transitions (mainly in the RQ sub-branch) of H2S in the submillimeter region. We show that the lineshapes are well reproduced by the Speed-Dependent Voigt profile accounting for the speed dependence of relaxation rates which display linear pressure dependencies. Using the Robert and Bonamy formalism, these coefficients were calculated, showing the need to account for all contributions of the intermolecular interaction for N2-broadening. The calculated coefficients are consistent with the measured data and the average accuracy of the line parameters has been estimated to be about 5%. The observed J″ and Ka″ rotational dependences have been analyzed using an empirical model and compared to previous rovibrational studies in the ν2 fundamental band. In our study the self- and the N2-broadening coefficients decreases monotonically with Ka″ and J″, respectively.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Physiques et Chimie de l'Environnement Atmosphérique

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL