Electric field modulation of electron transfer reaction rates in isotropic systems: Long-distance charge recombination in photosynthetic reaction centers
- Stanford Univ., CA (USA)
A general method is demonstrated for experimentally obtaining the rate constant of electron transfer as a function of the free energy of the reaction in nonoriented systems. An external electric field is used to modulate the energy levels of dipolar states and thereby affect the electron-transfer rate. The method is valid for any electron-transfer system which has a fixed distance between the donor and acceptor. The method is employed to obtain the experimental rate vs applied electric field curve of the charge recombination reaction between the oxidized special pair electron donor and the reduced ubiquinone acceptor in bacterial reaction centers of Rb. sphaeroides at 80 K. The experimental rate vs electric field curve is shown to be equivalent to the rate vs free energy curve when it is linearly scaled by the dipole moment of the charge-transfer state and the local field correction.
- OSTI ID:
- 6187506
- Journal Information:
- Journal of Physical Chemistry; (USA), Vol. 94:12; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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