The incorporation of molecular oxygen into a molecular entity. There are three common
mechanisms: Type I: the reaction of triplet molecular oxygen with radicals formed
photochemically. Type II: the reaction of photochemically produced singlet molecular
oxygen with molecular entities to give rise to oxygen containing molecular entities.
The third mechanism proceeds by
electron transfer producing superoxide
anion as the reactive species.
Source:
PAC, 1996, 68, 2223
(Glossary of terms used in photochemistry (IUPAC Recommendations 1996))
on page 2264