We and others have investigated the effects of light intensity on observed quantum yields. To the best of our knowledge, however, it has not been pointed out in the literature that parameters such as the extinction coefficient and window area can also have pronounced effects on the observed quantum yield. In particular, because the quantum yield can vary with the extinction coefficient, a change in the observed quantum yield corresponding to a change in wavelength may be due only to the different extinction coefficients at the respective wavelengths. In such a case, any conclusions regarding the photochemistry or photophysics drawn on the assumption of a true wavelength effect will be incorrect. In this note we quantify the effects that optical density, radiation intensity, and window area can have on the observed quantum yield, and we discuss the origin of these effects.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry