Lorentzian band shape

This band shape is described by the function: \[F\left(\nu - \nu _{0}\right) = \frac{1}{\pi }\ \gamma \ ((\nu - \nu _{0})^{2}+\gamma ^{2})^{-1}\] where \(\nu_{0}\) is the mean band position, \(\gamma \) is the half band width at half maximum, and \(F\ (\nu - \nu _{0})\) is the @F02526@ function.
See also:
Gaussian band shape
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2252 [Terms] [Paper]