A THEORETICAL-STUDY OF ULTRAFAST BIOLOGICAL ELECTRON-TRANSFER

We report a theoretical study of femtosecond transient measurements ap plied to observe the quantum beats in the time-resolved spectra of the reaction center of photosynthetic bacteria. By numerically solving th e coupled master equations, the femtosecond pump-probe stimulated emis sion spectra are simulated for the non-electron transfer (non-ET) case , the weak ET case and the strong ET case. For the weak ET case, quant um beasts with in-and out-of-phase relations are seen in the calculate d time-resolved spectra during the one-way ET taking place. For the st rong ET case, we find that a quite different phase relation appears in the calculated time-resolved spectra as the system undergoes a vibron ic transition.