The number of defined events which occur per photon absorbed by the system. The integral quantum yield is
For a photochemical reaction,
The differential quantum yield is
where d[X]/dt is the rate of change of the amount of (substance) concentration of a measurable quantity, and n the amount of photons (mol or its equivalent einsteins) absorbed per unit time. ![[phi]](/img3/P_files/PHI.gif)
can be used for photophysical processes or photochemical reactions. IUPAC PHOTOCHEMICAL GLOSSARY (1992).
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