spectral photon flux (photon irradiance), \(E_{\textrm{p,}\lambda}\)

https://doi.org/10.1351/goldbook.S05821
The @P04637@ \(E_{\text{p}}\), at @W06659@ \(\lambda \) per unit @W06659@ interval. The SI unit is \(\mathrm{s}^{- 1}\ \mathrm{m}^{- 3}\), but a commonly used unit is \(\mathrm{s}^{- 1}\ \mathrm{m}^{- 2}\ \mathrm{nm}^{- 1}\). Alternatively, the term can be used with the amount of photons (mol or its equivalent @E01914@), the SI unit then being \(\mathrm{mol}\ \mathrm{s}^{- 1}\ \mathrm{m}^{- 3}\) and the common unit \(\mathrm{mol}\ \mathrm{s}^{- 1}\ \mathrm{m}^{- 2}\ \mathrm{nm}^{- 1}\).
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2275 [Terms] [Paper]