Referred to actinometers based on spectrophotometric measurements,
.
is the quantum yield of the actinometer at the excitation wavelength and
is the observation wavelength, which may be the same as or differ from the former.
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 426
.
is the quantum yield of the actinometer at the excitation wavelength and
is the observation wavelength, which may be the same as or differ from the former.