https://doi.org/10.1351/goldbook.14044
Number of entities (product) formed (alternatively the number of reactant entities disappearing) divided by the number of ultraviolet, visible, or infrared photons incident (prior to absorption) on the system and in a wavelength range \(\lambda_{1}{-}\lambda_{2}\).
Notes:
- Quantity relevant in applications of photocatalysis where the interest is to assess an engineering efficiency of energy out vs. energy in. In this context, the quantity has a well-defined meaning only when the operating conditions are also stated and results reported in terms of the initial conditions.
- When using photon flux (number basis or chemical amount basis) the term photonic efficiency is preferred, as efficiency refers to excitation within a wavelength range, whereas for monochromatic irradiation (and incident photons) the term photonic yield should be used.