src.Atomic.Opacity.HIbf_CrossSection

src.Atomic.Opacity.HIbf_CrossSection(T, wl)[source]

return bound-free cross section of a HI atom in LTE in unit of e-26 cm^2

Parameters

  • T (Temperature [\(K\)]) –

  • wl (wavelength [\(\AA\)]) –

Notes

from 1.

HI bound-free opacity in LTE is

k(T,wl) = n_HI * HIbf_CrossSection(T,wl) * 1e-26 (/cm)

  • n_HI: hydrogen number density in cm^(-3)

  • stimulated emission is corrected

  • partition function of HI is assumed to be 2.0, which is valid for T < 2.e4 K

Modification history:

  • 2019.9.15 K.Ichimoto from IDL ahic.pro

References

1

varnazza et al. (1976) ap.j.suppl. vol.30, 1.