Physical Chemistry 2 Quiz
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A researcher studies the temperature dependence of fluorescence in a rigid glass from 4 K to 300 K. At 4 K, only fluorescence is observed (τ = 8 ns). As temperature increases, the fluorescence intensity decreases and the lifetime shortens. At 77 K, delayed fluorescence appears with the same spectrum as prompt fluorescence but with a lifetime of 50 ms. At 300 K, both prompt and delayed fluorescence are present. What mechanism best explains the delayed fluorescence?
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