Numerical Modeling of the Charge Transfer Along ID Molecular Chain 'Donor-Bridge-Acceptor' at T = 300 K

摘要

We consider charge transfer along homogeneous chain of sites (such as DNA fragment) with the ends which imitate a donor and an acceptor. We performed direct numerical experiments based on the semi-classical Holstein model. To take into account the temperature, Langevin thermostat is used. Recently it has been shown that in homogeneous chains the charge distribution in thermodynamic equilibrium state (TDE) depends on the thermal energy of the lattice subsystem. Here, we have calculated dynamics of the system from the initial state "the charge is localized at the donor" over time intervals to the attainment of the TDE. The time intervals dependence on the length of the chain at fixed temperature is estimated. Part of parameter values are chosen as for DNA fragments of the GA... AGGG type. The results of the calculations are compared with the data of biophysical experiments on the hole transfer in DNA sequences.