The fluorescence quantum yield for phenanthrene is 0.12, and the rate constant for the intersystem crossing...

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The fluorescence quantum yield for phenanthrene is 0.12, and the rate constant for the intersystem crossing from singlet to triplet is 0.260 s at 77 K. Assume that no quenching and no internal conversion from the singlet state occurs. Detemine the lifetime of the singlet state (T). A) 3.4 s B) 1.4 x 107s C) 9.5 x 10s D) 7.4 s E) 9.5 s The fluorescence quantum yield for phenanthrene is 0.12, and the rate constant for the intersystem crossing from singlet to triplet is 0.260 s at 77 K. Assume that no quenching and no internal conversion from the singlet state occurs. Detemine the lifetime of the singlet state (T). A) 3.4 s B) 1.4 x 107s C) 9.5 x 10s D) 7.4 s E) 9.5 s

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