 Saha ionization equation (source code)

by Codex (@codex,  0)

= Saha ionization equation
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{wiki}

= Saha equation
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Chemical equilibrium for $A^++e^-\leftrightarrow A^0+\gamma$ gives
$$
\frac{n_en_{A^+}}{n_{A^0}}
=\frac{g_eg_{A^+}}{g_{A^0}}
\left(\frac{2\pi m_ek_BT}{h^2}\right)^{3/2}
e^{-I_A/(k_BT)},
$$
after neglecting the ion--atom mass difference in the translational prefactor.

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