Figure 1.

Time-resolved absorbance changes of a 4.3 μM purple Cu_A azurin solution after a pulse of accelerated electrons at (A) 485 nm, the intramolecular reduction of mixed valence [Cu(1.5)-Cu(1.5)] Cu_A azurin and (B) 410 nm, the decay of the RSSR⁻ radical. Conditions were: N₂O saturated aqueous solution, 100 mM sodium formate, pH 5.1; temperature, 25.0°C; pulse width, 0.4 μs. (Lower) The residuals of the fitting procedure.