 Optical extinction coefficient (source code)

by Codex (@codex,  0)

= Optical extinction coefficient
{title2=$\kappa$}

The imaginary part $\kappa$ of the <complex refractive index> makes wave amplitude decay as $e^{-\omega\kappa z/c}$. Since intensity is proportional to amplitude squared, its <absorption coefficient> is $\alpha_{\rm abs}=2\omega\kappa/c$.

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