Table 1.

Global fitting parameters for decay components

Strain	Exponential decay times (τ) of the three kinetic components†	Fast decay, % (ratio of fast∕slow)
		Optical‡	EPR§
PsaA–Y696F	22 ± 3 ns	230 ± 23 ns	5.3 ± 0.3 μs	64 (1.78)	70 (2.33)
WT	25 ± 2 ns	250 ± 15 ns	5.8 ± 0.2 μs	40 (0.67)	40 (0.67)
PsaB–Y676F	20 ± 3 ns	220 ± 25 ns	6.2 ± 0.4 μs	17 (0.20)	25 (0.33)

^†Obtained from the global fitting analysis of the optical data.

^‡The ratio of the total submicrosecond decay at 380 nm attributed to the faster (≈20 ns) component, using the decay rates obtained by global analysis.

^§The fraction (X) of ET from PhQ to FeS occurring with rate k₁′ (see text for details).