spectral fluence rate, Eλ,o 

https://doi.org/10.1351/goldbook.ST07479
Derivative of fluence rate, Eo, with respect to wavelength, λ. SI unit is W m−3; common unit is W m−2 nm−1.
Note:
All spectral terms may also be defined as derivatives with respect to frequency, ν, or wavenumber, ν~, and are referred to, when necessary, as in terms of wavelength, or frequency or wavenumber, respectively.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 423 [Terms] [Paper]
Citation: 'spectral fluence rate' 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.ST07479 RIS BibTex EndNote
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Last revised: February 24, 2014