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16 a quantum efficiency of unity (Φ = 1) was assumed in eq 5 to obtain independent estimates of the triplet lifetime (τ); this procedure is mutually consistent with the present analysis, except that different variables (Φ or τ) are kept constant to allow the determination of the other.
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A reviewer has suggested that an alternative explanation for the observed discrepancy of the preparative quantum efficiency for photoreduction and the spectroscopic radical yield could derive from efficient singlet quenching and photoreduction by benzhydrol. This possibility cannot be ruled out because the concentration range of benzhydrol is too limited to acquire accurate data.
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