https://doi.org/10.1351/goldbook.R05064
Lifetime
of an excited molecular entity in the absence of radiationless transitions. The reciprocal of the first-order rate constant
for the radiative step, or the reciprocal of the sum of these rate constants if there is more than one such step. The equivalent term, natural lifetime, is discouraged.Notes:
- Approximate expressions exist relating
to theoscillator strengthof the emitting transition. - The subscript
is used in this definition, whereas the superscript is used to indicate a non-quenchedlifetimein the Stern-Volmer kinetic relationships.