Schmidt, Stefan; Arlt, Thomas; Hamm, P.; Huber, H.; Nägele, T.; Wachtveitl, J.; Meyer, M.; Scheer, Hugo; Zinth, Wolfgang
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*.