First steps towards time-resolved BioXAS at room temperature: state transitions of the manganese complex of oxygenic photosynthesis

Haumann, M.; Pospíšil, P.; Grabolle, M.; Müller, C.; Liebisch, P.; Solé, V.A.; Neisius, T.; Dittmer, J.; Iuzzolino, L.; Dau, H.

doi:10.1107/S0909049502012955

Figure 1
(a) Time scan of the X-ray fluorescence from the Mn complex of PSII for an excitation energy of 6549.5 eV monitored at room temperature. Solid line: a single-exponential simulation with a rate constant of 0.9 min⁻¹. The arrows indicate the times at which the XANES spectra (inset) were recorded. Inset: Mn XANES spectra after 0.5 s and 3 min of X-ray exposure. The arrow indicates the increase in fluorescence intensity at 6549.5 eV. (b) Time course of the Mn K-edge energy. Energy values were derived from XANES scans like the ones shown in the inset of (a). Inset: K-edge energies of various Mn oxides. The straight line was used to relate the K-edge positions shown in the main trace (second y-scale) to Mn oxidation states.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 9| Part 5| August 2002| Pages 304-308

doi:10.1107/S0909049502012955

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