Excitations and excitons in photosystem I

  • Beddard G
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A review with 83 refs. The elementary requirements for energy transfer in a photosynthetic antenna are discussed. Energy migration between chlorophyll mols. in the PSI antenna reaction center complex was modelled using a geometry based on the recent X-ray structure. The migration is trap-limited and an intrinsic electron transfer rate const. of 1.3 ps-1 was obtained by modifying the model to account for exptl. results obtained from antennae of different sizes. Exciton coupling between pairs of Chlorophyll mols. was calcd. and it is found that to prevent self-quenching their interplanar sepn. must be greater than or equal to 5 .ANG.. In the PSI reaction center, exciton coupling between adjacent chlorophylls was found to be around 300 cm-1 with no particularly large value between the special pair being necessary to describe the exptl. obsd. transient spectra of P700+-P700 and A0--A0. Electrochromic interaction is particularly important in reproducing the A0--A0 spectrum.

Author-supplied keywords

  • Antenna
  • Electron transfer
  • Energy transfer
  • Exciton coupling
  • Photosystem I
  • Reaction centre

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  • G. S. Beddard

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