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Which 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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