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Schmidt, Stefan and Arlt, Thomas and Hamm, P. and Huber, H. and Nägele, T. and Wachtveitl, J. and Meyer, M. and Scheer, Hugo and Zinth, Wolfgang (1994): Energetics of the primary electron transfer reaction revealed by ultrafast spectroscopy on modified bacterial reaction centers. In: Chemical Physics Letters, Vol. 223, No. 1-2: pp. 116-120




The modification of reaction centers from Rhodobacter sphaeroides by the introduction of pheophytins instead of bacteriopheophytins leads to interesting changes in the primary photosynthetic reaction: long-living populations of the excited electronic state of the special pair P* and the bacteriochlorophyll anion B−A show up. The data allow the determination of the energetics in the reaction center. The free energy of the first intermediate P+B−A, where the electron has reached the accessory bacteriochlorophyll BA lies ≈ 450 cm−1 below the initially excited special pair P*.