Rayleigh extinction is only significant for wavenumbers >3000
cm-1 (wavelengths < 3 µm) —
regions where the thermal
emission of the atmosphere is negligible
The extinction cross-section calculation is based on
Bodhaine et al (1999)
appropriate for the earth's atmosphere. For
other atmospheres,
refractivity
(subroutine refrac_fnc.f90) and depolarisation
(subroutine spcrex_fnc.f90)
might have to be modified.
