Ionization

Saha equation
constants:kappa


Parameters

number density
n \(/m^3\)
temperature
T \(K\)
Ionization energy
`U_i` \(eV\)

Output

Ionization ratio 

`n_i/n ~~ 2.4xx10^21 T^{3/2}/n_i e^{-U_i/{KT}}`