Function
\(y = a/(b^{2} + x^{2})\) where
\(a\) and
\(b\) are constants.
Note:
If \(x\) is replaced by \(\tilde{\nu} - \tilde \nu_{0}\) this function yields a Lorentzian band centered at \(\tilde{\nu}_{0}\).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 653 (https://doi.org/10.1515/pac-2019-0203)