spin-statistical factor

in diffusion-controlled reactions
https://doi.org/10.1351/goldbook.ST07482
From the possible @E02086@ pairs between states of different spin multiplicity, only those conserving multiplicity in going to products are expected to react.
Note:
This factor determines the efficiency of @D01716@-controlled reactions, which have an @E02089@. Typical examples are @Q05007@ of @F02453@ of aromatic @H02889@ by O2, @Q05007@ of triplet states by O2, and triplet–triplet @A00366@.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 428 [Terms] [Paper]
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). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last revised: February 24, 2014