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Photo-Induced Radical Pairs Investigated Using Out-Of-Phase Electron Spin Echo

  • Sergei A. Dzuba
  • Arnold J. Hoff
Chapter
Part of the Biological Magnetic Resonance book series (BIMR, volume 19)

Abstract

Electron spin echo experiment on photo-induced radical pairs in photosynthetic reaction centers produces the echo signal which is out-of-phase due to spin coherence. This signal is strongly modulated because of the electron spin-spin dipolar and exchange couplings in the pair. Fourier transformation of the time-domain modulation produces a “Pake doublet” from the two coupled spins, which allows the accurate determination of the distance between the two radicals. The precision with which the distance can be measured is 0.3 – 0.4 Å, for radicals separated in the pair by ~ 30 Å. This high precision provides a very sensitive tool for structural investigations in photosynthetic reaction centers. The method is applicable to spin-correlated radical pairs separated by 20 – 40 Å and possessing an EPR linewidth accessible for the full excitation by the microwave pulses.

Keywords

Electron Paramagnetic Resonance Radical Pair Microwave Pulse Photosynthetic Reaction Center Electron Spin Echo Envelope Modulation 
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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Copyright information

© Kluwer Academic / Plenum Publishers, New York 2002

Authors and Affiliations

  • Sergei A. Dzuba
    • 1
  • Arnold J. Hoff
    • 2
  1. 1.Institute of Chemical Kinetics and CombustionRussian Academy of SciencesNovosibirskRussia
  2. 2.Department of BiophysicsLeiden UniversityLeidenThe Netherlands

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