2-DIMENSIONAL FREE-ENERGY SURFACES FOR PRIMARY ELECTRON-TRANSFER IN APHOTOSYNTHETIC REACTION-CENTER

Fushiki and Tachiya [Chem. Phys. Lett. 255 (1996) 83] recently analyze d the free energy surfaces of the initial electron-transfer processes in photosynthetic bacterial reaction centers. The authors state that w hen the results from simulations described by Warshel, Chu and Parson [Photochem. Photobiol. A: Chem. 82(1994) 123] are analyzed using their formulation, the calculated energy of a key ion-pair state is inconsi stent with experiment. They also state that previous analyses of the p hotosynthetic electron-transfer reactions had been limited to one-dime nsional free energy surfaces. We show here that both these assertions are incorrect.