Polarized Pump-Probe Spectroscopy of Photosystem I Antenna Excitation Transport
Electronic excitation transport (EET) is currently being widely studied in photosystem I light-harvesting and core antennae of green plants. In this work, we have extended our earlier ultrafast pump-probe experiments on PSI-60 particles  to PSI-200 particles (Chl/P700 ∼ 200) from spinach chloroplasts. Our magic-angle Chl a Qy photobleaching decays parallel the multiexponential fluorescence decays reported elsewhere for particles of similar size [2–4]. The depolarization lifetimes in the corresponding anisotropic decays show marked wavelength dependence between 660 and 681 nm.
KeywordsSpinach Chloroplast Spectral Form Core Antenna Peripheral Antenna Exciton Splitting
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