Fast Electron Transfer Kinetics in Photosystem I from Transient EPR-Spectroscopy at Room Temperature
Following light excitation of the donor P700 and primary charge separation electron transfer in photosystem I (PSI) is believed to proceed via a chain of membrane bound acceptors termed Ao, A1, FX, FA, FB /1,2/. Transient EPR-spectroscopy of spin polarized signals provides a useful tool to study the kinetics of these processes provided the transfer times fall within the time resolution presently approaching the physical limit around 10 ns.
KeywordsSodium Ascorbate Intact Sample Iron Sulfur Center 100kHz Field Modulation Early Spectrum
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