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← ScienceWhich consequence results when quenching delays molecule orbitals reorganization?
A)Fluorescence quantum yield increases
B)Phosphorescence peak intensity decreases✓
C)Intersystem crossing efficiency drops
D)Triplet state lifetime becomes shorter
💡 Explanation
When quenching reduces intersystem crossing, it leads to fewer molecules populating triplet states. The reduced population suppresses phosphorescence via *spin-orbit coupling*, rather than favoring fluorescence. Therefore, the phosphorescence peak weakens, rather than fluorescence intensifying because of direct excitation.
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