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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[link], inset) and a normalized spectrum attributable to hexaquo Mn(II) (solid line) as obtained after the time scan by a rapid EXAFS scan on the same spot (see Fig. 2-iii[link]). For the normalized rapid-scan spectra, 25–30 individual scans have been averaged.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 1| December 2005| Pages 35-44
doi:10.1107/S0909049504027803
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