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arXiv 1108.3452quant-phphysics.bio-ph
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Fenna-Matthews-Olson三聚体电子激发转移中量子振荡的抑制和对位能的依赖

Suppression of quantum oscillations and the dependence on site energies in electronic excitation transfer in the Fenna-Matthews-Olson trimer

G. Ritschel, J. Roden, W. T. Strunz, A. Aspuru-Guzik, A. Eisfeld

摘要:

从理论上研究了绿硫细菌Fenna-Matthews-Olson(FMO)复合体的光合复合体中的能量传递,并将FMO三聚体的所有三个亚基(单体)和最近发现的第八个细菌叶绿素(BChl)分子考虑在内。我们发现,在所有考虑的情况下,有很少的单体之间的转移。由于认为第八BChl位于主光捕获天线附近,因此我们查看当BChl 8初始被激发时的情况与当BChl 1或6初始被激发时通常考虑的情况之间的转移差异。我们发现强烈的差异,在转移动力学,定性和定量。当激发态动力学在FMO复合物的位点8处初始化时,我们看到激发的缓慢指数状衰减。这与仅考虑7个站点或站点1和6处的初始化时发生的振荡和相对快速的转移形成对比。此外,我们表明,在文献中发现的电子跃迁能的值的差异导致一个很大的差异,在转移动力学。

英文摘要:

Energy transfer in the photosynthetic complex of the Green Sulfur Bacteria known as the Fenna-Matthews-Olson (FMO) complex is studied theoretically taking all three subunits (monomers) of the FMO trimer and the recently found eighth bacteriochlorophyll (BChl) molecule into account. We find that in all considered cases there is very little transfer between the monomers. Since it is believed that the eighth BChl is located near the main light harvesting antenna we look at the differences in transfer between the situation when BChl 8 is initially excited and the usually considered case when BChl 1 or 6 is initially excited. We find strong differences in the transfer dynamics, both qualitatively and quantitatively. When the excited state dynamics is initialized at site eight of the FMO complex, we see a slow exponential-like decay of the excitation. This is in contrast to the oscillations and a relatively fast transfer that occurs when only seven sites or initialization at sites 1 and 6 is considered. Additionally we show that differences in the values of the electronic transition energies found in the literature lead to a large difference in the transfer dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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