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Long-Range Electron Transfer Special Feature: Protein dynamics and electron transfer: Electronic decoherence and non-Condon effects

机译:远程电子转移特殊功能:蛋白质动力学和电子转移:电子退相干和非密码子效应

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摘要

We compute the autocorrelation function of the donor-acceptor tunneling matrix element 〈TDA(t)TDA(0)〉 for six Ru-azurin derivatives. Comparison of this decay time to the decay time of the time-dependent Franck-Condon factor {computed by Rossky and coworkers [Lockwood, D. M., Cheng, Y.-K. & Rossky, P. J. (2001) Chem. Phys. Lett. 345, 159-165]} reveals the extent to which non-Condon effects influence the electron-transfer rate. 〈TDA(t)TDA(0)〉 is studied as a function of donor-acceptor distance, tunneling pathway structure, tunneling energy, and temperature to explore the structural and dynamical origins of non-Condon effects. For azurin, the correlation function is remarkably insensitive to tunneling pathway structure. The decay time is only slightly shorter than it is for solvent-mediated electron transfer in small organic molecules and originates, largely, from fluctuations of valence angles rather than bond lengths.
机译:我们为六个Ru-天青素衍生物计算了供体-受体隧穿矩阵元素〈TDA(t)TDA(0)〉的自相关函数。该衰减时间与随时间变化的弗兰克-康登因子的衰减时间的比较(由Rossky和他的同事计算得出[Lockwood,D.M.,Cheng,Y.-K. &Rossky,P.J.(2001)Chem。物理来吧345,159-165]}揭示了非孔顿效应影响电子传输速率的程度。研究〈TDA(t)TDA(0)〉与供体-受体距离,隧穿通道结构,隧穿能量和温度的关系,以探索非康登效应的结构和动力学起源。对于天青蛋白,相关函数对隧穿通道结构非常不敏感。衰变时间仅比在有机小分子中溶剂介导的电子转移略短,并且很大程度上是由化合价而不是键长的波动引起的。

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