photon fluence \(H_{\textrm{p,o}}\), \(F_{\textrm{p,o}}\)
Amount of photons (quanta of radiation) incident on a small sphere from all directions, divided by the cross-sectional area of that sphere and integrated over time. Photons per surface area (\(\textrm{quanta m}^{-2}\)). SI unit is \(\textrm{m}^{-2}\).
  1. Mathematical definition: \(H_{\textrm{p,o}} = F_{\textrm{p,o}} = \textrm{d}N_{\textrm{p}}/\textrm{d}S = \int_{t}E_{\textrm{p,o}}\textrm{d}t\) with \(E_{\textrm{p,o}}\) the @P04635@, integrated over the duration of the @I03255@, \(t\). If \(E_{\textrm{p,o}}\) is constant over the time interval, \(H_{\textrm{p,o}} = F_{\textrm{p,o}} = E_{\textrm{p,o}}t\)
  2. This quantity can be used on a @C01019@ basis by dividing \(H_{\textrm{p,o}}\) by the @A00543@, the symbol then being \(H_{\textrm{n,p,o}}\), the name 'photon fluence, amount basis', SI unit is \(\textrm{mol m}^{-2}\); common unit is \(\textrm{einstein m}^{-2}\).
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 395 [Terms] [Paper]