CO2 sub-Lorentzian line wings

HELIOS-K supports sub-Lorentzian profiles according to the \(\chi\) factors from Perrin and Hartmann 1998. The \(\chi\) factors are specified in the files chiPH89__CO2-CO2.dat and chiPH89__CO2-N2.dat. In these files, the affected wavenumber range can be set. The param.dat file contains the option subLorentzianfile, where the file name of the used \(\chi\) factors file can be set. If a filename is set there, the sub-Lorentzian line wings are enabled.

In principle, the \(\chi\) factors can be applied also to other molecules than CO2, but this is not recommended to do.

M.Y.Perrin and J.M.Hartmann, 1988 (TEMPERATURE-DEPENDENT MEASUREMENTS AND MODELING OF ABSORPTION BY CO2-N2 MIXTURES IN THE FAR LINE-WINGS OF THE 4.3 # m CO2 BAND).

In Fig. 2 is shown an example of the sub-Lorentzian profile for CO2.

Relevant parameters for full Voigt:
  • doStoreFullK = 1

  • cutMode = 0

  • cut = 25.0

  • profile = 1

  • subLorentzianfile = -

Relevant parameters for sub-Lorentzian Voigt profile in specific wavenumber band:
  • doStoreFullK = 1

  • cutMode = 0

  • cut = 25.0

  • profile = 1

  • subLorentzianfile = chiPH89__CO2-CO2.dat

  • in chiPH89__CO2-CO2.dat:
    • range in cm^-1

    • 2100 2500

Relevant parameters for sub-Lorentzian Voigt profile in the full wavenumber range:
  • doStoreFullK = 1

  • cutMode = 0

  • cut = 25.0

  • profile = 1

  • subLorentzianfile = chiPH89__CO2-CO2.dat

  • in chiPH89__CO2-CO2.dat:
    • range in cm^-1

    • 0 10000

../_images/plot0019.png

Fig. 2 CO2 sub-Lorentzian wings with \(\chi\) factors for Perrin and Hartmann 1998. Top panel,: \(\chi\) factors applied to the band 2100-2600 cm^-1. Bottom panel: \(\chi\) factors applied to the full wavenumber range. CO2, Hitran 2016, T = 250 K, P = 2 atm.