Kasha–Vavilov rule

https://doi.org/10.1351/goldbook.K03371
The @Q04991@ of @L03641@ is independent of the @W06659@ of exciting radiation. There are exceptions to this rule.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2250 [Terms] [Paper]