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Figure 5
Pathways of X-ray-driven reduction. (a) Observed (circles) and simulated (black lines) time courses for reduction of TTQOX/Cu2+. The simulation curves were calculated using the microscopic rate constants derived from the mechanism in (b). Data points are shown for 440 nm, 428 nm, 330 nm, 600 nm (TTQOX/Cu2+ crystal) and 600 nm (TTQNQ/Cu2+ crystal). (b) Hypothetical mechanism showing all possible reduction and inter-redox center electron transfers for X-ray reduction of TTQOX/Cu2+. (c) Simpler mechanism for TTQNQ/Cu2+ X-ray-driven reduction.

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