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Which outcome occurs when molecular oxygen quenches triplet excitons?

A)Phosphorescence is rapidly reduced
B)Fluorescent yield increases substantially
C)Vibrational relaxation becomes inhibited
D)Intersystem crossing is more probable

💡 Explanation

Oxygen promotes intersystem crossing in triplet states. Non-radiative decay, called Oxygen Quenching then competes with radiative phosphorescence, because the triplet excited state energy transfers to oxygen. Therefore, phosphorescence diminishes rather than fluorescence because intersystem crossing enhances triplet yield.

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