Energy Gap Dependence of the Solvent Dynamics Effect on Electron Transfer Rates in Non-Linear Response Systems

Energy Gap Dependence of the Solvent Dynamics Effect on Electron Transfer Rates in Non-Linear Response Systems
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非线性响应系统中溶剂动力学效应对电子转移速率的能隙依赖性

DOI:
10.1143/jpsj.61.2577
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发表时间:
1992
影响因子:
1.7
通讯作者:
T. Kakitani
T. Kakitani
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
A. Yoshimori;T. Kakitani

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通过求解扩散反应方程,研究了极性溶液中溶剂动力学效应对电子转移速率的能隙依赖性。这项研究的新点是:(1)我们处理非线性响应系统,其中平移运动与旋转运动非线性耦合;(2)我们系统地研究电荷分离(CS)和电荷复合(CR)反应的溶剂动力学效应的能隙依赖性。非线性自由能函数的特征是基于模型系统的蒙特卡罗模拟数据,其中溶剂平移位置可以移动或固定。计算结果表明,只要非线性耦合足够大,CS反应的能隙定律受溶剂动力学的影响很小,而CR反应的能隙定律则受到很大的影响。
Energy gap dependences of solvent dynamics effects on the electron transfer rate in polar solutions are investigated by solving the diffusion-reaction equation. New points in this study are that (1) we treat non-linear response systems where the translational motion couples non-linearly with the rotational motion and (2) we investigate systematically the energy gap dependence of the solvent dynamics effect for the charge separation (CS) and charge recombination (CR) reactions. The non-linear free energy functions are characterized, based on the Monte Carlo simulation data for model systems where solvent translational positions are either allowed to move or fixed. The calculated results are that so far as the non-linear coupling is substantial, the energy gap law of the CS reaction is little affected by the solvent dynamics, while that of the CR reaction is greatly modified.