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Figure 3
Time course of X-ray photoreduction. (a) Time scan of fluorescence at 6552 eV on a dark-adapted PSII sample (Mn complex in the S1 state). The rise shows a lag phase with a duration of ∼3 s. Inset: the first three seconds of the main trace. (b) Sampling-XANES spectra of the Mn complex (symbols) before, during and after X-ray irradiation for 60 s. Spectra have been obtained by averaging over 300 ms of time-scan data as in (a) immediately after the onset and after 3, 10, 25, 30 and 60 s of X-ray irradiation (arrow). The lines represent a normalized rapid-scan spectrum of the S1 state (dashes) (see Fig. 2-i ![]() ![]() |