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.
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 411
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
to
the oscillator strength of the emitting transition.
is used in this definition, whereas the superscript
is used to indicate
a non-quenched lifetime in the Stern-Volmer kinetic relationships.
