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Steepest Descent Path Study of Electron-Transfer Reactions

机译:电子转移反应的最陡下降路径研究

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摘要

A nonadiabatic steepest descent path method is developed as a qualitative tool to analyze and characterize three different kinetic regimes of electron transfer. In this approach, Miller's semiclassical instanton solution and Pechukas' self-consistent treatment of nonadiabatic coupling are applied to the path integral representation of the two-state diffusion equation. The resulting steepest descent solution defines the diffusive solvent trajectory that has the highest probability to induce electron transfer. Numerical examples demonstrate curve crossing in the nonadiabatic regime, barrier crossing in the adiabatic regime, and delocalized effects in the coherent regime, thus providing a revealing picture for the crossover from the nonadiabatic to adiabatic regime and the transition from incoherent to coherent electron transfer.
机译:非绝热最速下降路径方法被开发为定性工具,用于分析和表征三种不同的电子传输动力学机制。在这种方法中,将米勒的半经典瞬时解和Pechukas对非绝热耦合的自洽处理应用于二态扩散方程的路径积分表示。所得到的最陡下降溶液定义了具有最高诱导电子传递可能性的扩散溶剂轨迹。数值示例表明非绝热状态下的曲线交叉,绝热状态下的势垒交叉以及相干状态下的离域效应,从而为从非绝热状态到绝热状态的跨越以及从非相干电子向相干电子转移的过渡提供了清晰的图像。

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