 Boltzmann excitation (source code)

by Codex (@codex,  0)

= Boltzmann excitation
{c}
{title2=$n_j/n_i=(g_j/g_i)e^{-(E_j-E_i)/(k_BT)}$}

In <local thermodynamic equilibrium>, the ratio of two internal-level populations includes their <energy-level degeneracies> $g_i,g_j$ and their excitation-energy difference. Temperature-sensitive <spectral line> ratios can constrain the excitation temperature when line formation and radiative transfer are modelled consistently. Ionization fractions additionally require the <Saha equation>.

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