resonance line 

in photochemistry
https://doi.org/10.1351/goldbook.R05340
The longest wavelength capable of exciting fluorescence in an atom.
See also: resonance fluorescence
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2271 [Terms] [Paper]
Citation: 'resonance line' 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.R05340 RIS BibTex EndNote
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Last revised: February 24, 2014