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Ultrafast Optical Spectroscopy of Photosystem I

  • Chapter
Photosystem I

Part of the book series: Advances in Photosynthesis and Respiration ((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.

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Authors and Affiliations

  1. Department of Physics, Purdue University, West Lafayette, IN, 47907, USA

    Sergei Savikhin

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  1. Sergei Savikhin
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  1. The Pennsylvania State University, Pennsylvania, USA

    John H. Golbeck

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© 2006 Springer

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Savikhin, S. (2006). Ultrafast Optical Spectroscopy of Photosystem I. In: Golbeck, J.H. (eds) Photosystem I. Advances in Photosynthesis and Respiration, vol 24. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4256-0_12

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