photon number

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