Lorentzian band shape 

https://doi.org/10.1351/goldbook.L03628
This band shape is described by the function: F(ν−ν0)=1π γ ((ν−ν0)2+γ2)−1 where ν0 is the mean band position, γ is the half band width at half maximum, and F (ν−ν0) is the frequency distribution function.
See also: Gaussian band shape
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2252 [Terms] [Paper]
Citation: 'Lorentzian band shape' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.L03628 RIS BibTex EndNote
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Last revised: February 24, 2014