Super Lorentzian effects on the wings of self-broadened HCl and of HCl diluted in Ar

23rd International Conference on Spectral Line Shapes

Tran, H.^1 ; Hartmann, J.-M.^1 ; Li, G.^2 ; Ebert, V.^2,3,4

Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA UMR CNRS 7583), Université Paris Est Créteil, Université Paris Diderot, Institut Pierre-Simon Laplace, 61 avenue du Général de Gaulle, Créteil

94010, France^1

Physikalisch-Technische Bundesanstalt, Bundesallee 100, Braunschweig

38116, Germany^2

Physikalisch Chemisches Institut, U Heidelberg, INF 253, Heidelberg

69116, Germany^3

Center of Smart Interfaces, TU Darmstadt, Petersenstraße 32, Darmstadt

64287, Germany^4

关键词: Calculated spectrum;    Classical molecular dynamics;    Fourier transform spectrometers;    High resolution;    Spectral shapes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/810/1/012039/pdf
DOI  :  10.1088/1742-6596/810/1/012039

来源: IOP

【 摘 要 】

Super-Lorentzian effects in the troughs between HCl lines were observed long time ago [Varanasi et al., J Quant Rad Transfer, Vol. 12, pag. 857, 1972]. The observed spectral shape was then modelled by using an empirical law and there was no explanation about the mechanisms underlying these super-Lorentzian effects. In this work, new spectra of pure HCl and HCl diluted in Ar have been measured using a high resolution Fourier Transform spectrometer, for pressure from 6 to 10 bars. Spectra of pure HCl and HCl in Ar have been also computed using classical molecular dynamics simulations (CMDS). First comparisons between CMDS-calculated spectra and measured ones, for regions at the troughs between HCl lines, show that the observed super-Lorentzian behaviour is correctly reproduced by the calculations. These results thus open the paths for the determination of the origin of these super-Lorentzian effects.