Factors Affecting Electron Spin Polarization in Photosynthetic Systems

  • M. C. Thurnauer
  • L. L. Feezel
  • A. L. Morris
  • U. Smith
  • J. R. Norris


The first steps of the plant photosystem I (PSI) primary reactions are believed to be: \({P_{700}}{A_0}{A_1}{^{1*}}{P_{700}}{A_0}{A_1} \to P_{700}^ + A_0^ - {A_1} \to P_{700}^ + {A_0}A_1^ - \) where P700 and A0 are chlorophyll species and A1 is a quinone-like molecule. (1) The initial suggestions that A0 and A1 act as electron acceptors in sequence prior to the acceptor X were based on EPR experiments which showed that two electron acceptors are photoaccumulated at low redox potential. (2,3) Support for this suggestion came from following the triplet state found in PSI as a function of the photoaccumulation of the proposed A 0 and A 1 , and interpretations of the transient electron spin polarized (esp) signal believed to be due to P 700 + A 1 which has been observed by time resolved EPR experiments.


Radical Pair Electron Spin Polarization Electron Transfer Step Plant Photosystem Photosynthetic Bacterial Reaction Center 
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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • M. C. Thurnauer
    • 1
  • L. L. Feezel
    • 1
  • A. L. Morris
    • 1
  • U. Smith
    • 1
  • J. R. Norris
    • 1
  1. 1.Chemistry DivisionArgonne National LaboratoryArgonneUSA

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