With non-radiative relaxation decreasing the lifetimes of excited states and phonon-assistance increasing the probability of energy transfer, the effects of size are complicated because these effects compete with one another.
2.
A . El-Sayed in the 1960s, this rule found in most photochemistry textbooks is useful in understanding phosphorescence, vibrational relaxation, intersystem crossing, internal conversion and lifetimes of excited states in molecules.
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