extinction_coefficient_MKS

Physics.Radiation.extinction_coefficient_MKS(n_u, pop_ratio, freq, Aul, dv)

Extinction coefficient in MKS units

Given the upper and lower level degeneracies, the upper and lower degenerate sublevel populations, the transition frequency, the Einstein A and the linewidth, returns the extinction coefficient.

:param n_u : upper degenerate sublevel population in cm^-3 :type n_u : float

:param pop_ratio : n_u/n_l :type pop_ratio : float

:param freq : transition frequency in Hz :type freq : float or int

:param Aul : Einstein A in 1/s :type Aul : float

:param dv : linewidth in cm/s :type dv : float

Returns

float (1/m)