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← ScienceWhich outcome occurs when a photoexcited dye molecule undergoes intersystem crossing?
A)Triplet state population increases significantly✓
B)Fluorescence quantum yield remains constant
C)Internal conversion rate accelerates rapidly
D)Vibrational relaxation timescale shortens
💡 Explanation
An increase in triplet state population occurs because intersystem crossing is a spin-forbidden transition altering the electronic spin state. This enables phosphorescence, therefore increasing triplet state population, rather than accelerating internal conversion, which dissipates energy non-radiatively.
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