Transient EPR spectroscopy of Photosystem I

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The goal of the proposed research is to gain a fundamental understanding of the factors governing the energetics and efficiency of photochemical energy conversion in both natural and artificial photosynthetic systems. The phenomenon of electron-spin polarization, which is associated with the early events that occur following the absorption of light, provides an observable that gives very detailed information on a molecular and electronic level. Our suite of modern time-resolved electron paramagnetic resonance (EPR) instruments allows us to use the spin polarization of light-induced paramagnetic species to study these events in detail and