Hyperchromic effect in IUPAC Gold Book (source code)

= Hyperchromic effect in IUPAC Gold Book
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https://goldbook.iupac.org/terms/view/H02923

H02923, DOI10.1351/goldbook.H02923. Increase in spectral-band intensity associated with substituents or molecular environment. Source: Glossary of terms used in photochemistry, IUPAC Recommendations1996, PAC68,2223,p.2247. The definition concerns intensity rather than wavelength shift.