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UV-Vis Absorption Maxima

The wavelengths of maximum absorption of UV or visible light by a substance, related to electronic transitions.
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The statement of the theorem

Let A(ν)\text{A}(\nu) be the absorbance spectrum of a substance. The UV-Vis Absorption Maxima (λmax\lambda_{max} or νmax\nu_{max}) are the frequencies νmax\nu_{max} that maximize the molar absorptivity Eˉ(ν)\bar{\text{E}}(\nu): \nνmax=arg⁡max⁡ν(Eˉ(ν))\nu_{max} = \arg \max_{\nu} \left( \bar{\text{E}}(\nu) \right) \nEquivalently, λmax=c/νmax\lambda_{max} = c / \nu_{max}, where cc is the speed of light.