Discussion of the Large Homogeneous Width of the P-Band in Bacterial- and Plant Reaction Centers

  • Douwe A. Wiersma
Part of the NATO ASI Series book series (NSSA, volume 149)


Recent hole-burning [1,2,3,4,5,6,7,8,9] and photon echo [2,8,9] experiments on bacterial and plant reaction centers have established that the P-bands in these systems exhibit extremely large ‘homogeneous’ widths which correspond to ultra-short relaxation times of less than 100 femtoseconds. A second characteristic feature of these transitions in bacterial reaction centers is the large change of dipole moment on optical excitation [10,11]. In photosystem II however, the observed dipole moment change is ‘normal’ [12], while its P-band still exhibits a large homogeneous width. The question is how these observations should be interpreted and how they relate to the dynamics of the initial photochemical event of charge separation in the reaction center.


Reaction Center Optical Excitation Special Pair Photosynthetic Reaction Center Vibronic Coupling 
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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • Douwe A. Wiersma
    • 1
  1. 1.Picosecond Laser and Spectroscopy Laboratory Department of ChemistryUniversity of GroningenGroningenThe Netherlands

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