## photon number, $$N_{\text{p}}$$

https://doi.org/10.1351/goldbook.PT07459
Total number of photons calculated as $$N_{\text{p}} = n_{\text{p}}\, N_{\text{A}}$$ with $$N_{\text{p}}$$ the amount of photons in einsteins and $$N_{\text{A}}$$ the @A00543@.
Note:
Mathematical definition: $$N_{\text{p}} = Q/h\nu$$ for monochromatic radiation of frequency $$\nu$$, with $$Q$$ the @R05039@.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 396 [Terms] [Paper]