Hughes, Joseph; Smith, Paul; Pace, Ronald; Krausz, Elmars
The illumination of oxygen-evolving PSII core complexes at very low temperatures in spectral regions not expected to excite P680 leads to charge separation in a majority of centers. The fraction of centers photoconverted as a function of the number of absorbed photons per PSII core is determined by quantification of electrochromic shifts on PheoD1. These shifts arise from the formation of metastable plastoquinone anion (QA-) configurations. Spectra of concentrated samples identify absorption in...[Show more]
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