Polarized Pump-Probe Spectroscopy of Photosystem I Antenna Excitation Transport

  • Timothy P. Causgrove
  • Shumei Yang
  • Walter S. Struve


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 [1] 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.


Spinach Chloroplast Spectral Form Core Antenna Peripheral Antenna Exciton Splitting 
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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Timothy P. Causgrove
    • 1
  • Shumei Yang
    • 1
  • Walter S. Struve
    • 1
  1. 1.Department of Chemistry and Ames Laboratory-UsdoeIowa State UniversityAmesUSA

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