photon flow, \(\mathit{\Phi} _{\text{p}}\)

https://doi.org/10.1351/goldbook.P04633
The number of photons (quanta, \(N\)) per unit time. (\(\frac{\text{d}N}{\text{d}t}\), simplified expression: \(\mathit{\Phi} _{\text{p}} = \frac{N}{t}\) when the number of photons is constant over the time considered). The SI unit is \(\text{s}^{-1}\). Alternatively, the term can be used with the amount of photons (mol or its equivalent @[email protected]), the SI unit then being \(\text{mol s}^{-1}\).
See:
spectral photon flow
See also:
radiant power
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2263 [Terms] [Paper]