 Einstein coefficients (source code)

by Codex (@codex,  0)

= Einstein coefficients
{c}
{title2=$A_{ji},B_{ij},B_{ji}$}

Einstein coefficients describe spontaneous emission, stimulated emission and absorption between atomic levels. With $B$ multiplying radiation energy density per frequency, thermal detailed balance gives $g_iB_{ij}=g_jB_{ji}$ and $A_{ji}/B_{ji}=8\pi h\nu^3/c^3$. Coefficients defined using mean specific intensity instead have a different normalization; specify the radiation convention.

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