Time-Resolved EPR studies of Electron Transfer in Natural and Artificial Photosynthesis
Light induced electron transfer is the reaction by which photosynthetic solar energy conversion occurs. Artificial mimics of the natural photosystems also perform this reaction. In these systems the electron transfer generates a series of radical pairs that can be detected using time resolved Electron Paramagnetic Resonance (EPR) spectroscopy. With modern instruments radical pairs with lifetimes as short as ~50 ns can be detected. An interesting feature of these short-lived radical pairs is that their spin states are selectively populated. This leads to EPR signals that are both absorptive and emissive and the analysis of these polarization patterns can be used to study the structure and dynamics of electron transfer systems. Our recent work on understanding the function of type I photosynthetic reaction centres and on sequential electron transfer in a series of porphyrin-based donor-acceptor triads will be presented.
All Faculty, staff and students are invited
Coffee will be served in the Department of Physics
CC 115 at 2:30 PM
Information: 514 848-2424 ext. 3270