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Photosystem I pp 155-175 | Cite as

Ultrafast Optical Spectroscopy of Photosystem I

  • Sergei Savikhin
Part of the Advances in Photosynthesis and Respiration book series (AIPH, volume 24)

Abstract

This review discusses energy and electron transfer in Photosystem I (PS I) complexes by means of ultrafast timeresolved optical techniques. In particular, this article addresses directly observable initial (sub)picosecond electronic excitation equilibration among different antenna chlorophyll forms and energy trapping by the charge separation process followed by picosecond electron transfer to the secondary electron acceptor A1. There is still no general agreement on the energy trapping classification in PS I; the validity of diffusion-limited, trap-limited, and mixedenergy trapping models is tested against the available experimental data. Ultrafast experiments on branch-specific complementary mutants of the reaction center open the unique possibility of differentiating between the two highly symmetrical branches of the reaction center, revealing the directionality of electron transfer in PS I. Finally, the most recent optical data questions the conventional sequence of electron transfer steps, and suggests the intriguing possibility that one additional intermediate radical pair may exist that was not previously observed.

Keywords

Charge Separation Core Complex Primary Charge Separation Synechococcus Elongatus Energy Trapping 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer 2006

Authors and Affiliations

  • Sergei Savikhin
    • 1
  1. 1.Department of PhysicsPurdue UniversityWest LafayetteUSA

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