Past exam of the chemistry course of the year 3 of the natural sciences course of the University of Cambridge / 2021 / Paper 2A / Section B / 22 / b / v / Solution

$k_Q=9.9\times 10^4\mathrm{d}{\mathrm{m}}^3\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{s}}^{-1}$. The unquenched triplet lifetime isSince the slope is $k_Q{\tau }_0$, the bimolecular rate constant isFor comparison, the unquenched phosphorescence yield in the unit-triplet-yield approximation is $180/198=0.909$.