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Temperature-dependent electron spin polarization of the triplet state of the primary donor in photosynthetic reaction centers ofRhodopseudomonas viridis: A time-resolved EPR study of single crystals and solid solution

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Abstract

The electron spin polarization (ESP) of triplet of the primary donor (3P) ofRhodopseudomonas viridis reaction centers (RCs) is anomalous at temperatures above 25 K, i.e. the steady-state ESP changes from AEEAAE to AEAEAE. Fast, time-resolved EPR measurements in solid solution and single crystals of RCs show that this phenomenon results most probably from fast anisotropic spin-lattice relaxation in the radical pair triplet state (k r≈ 5·109s−1 at 25 K).

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van den Brink, J.S., Gast, P., Hoff, A.J. et al. Temperature-dependent electron spin polarization of the triplet state of the primary donor in photosynthetic reaction centers ofRhodopseudomonas viridis: A time-resolved EPR study of single crystals and solid solution. Appl. Magn. Reson. 6, 67–81 (1994). https://doi.org/10.1007/BF03162482

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  • DOI: https://doi.org/10.1007/BF03162482

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