Abstract
The fluorescent emission kinetics of spinach subchloroplast Photosystems I and II particles have been studied on a picosecond time scale. Using picosecond laser pulses and an optical Kerr gate, the fluorescent decay times are measured to be 60±10 ps, and 200±20 ps for Photosystems I and II, respectively. The quantum yields are calculated to be 0.004 for Photosystem I and 0.013 for Photosystem II. Theory of exciton energy transfer and trapping is applied for the determination of intermolecular potential energy in the photosystems.
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