Relation between Vibrational Dephasing Time and Energy Gap Fluctuations.

Relation between Vibrational Dephasing Time and Energy Gap Fluctuations.
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振动失相时间与能隙波动之间的关系

DOI:
10.1021/acs.jpcb.7b02693
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发表时间:
2017
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
U. Kleinekathöfer
U. Kleinekathöfer
中科院分区:
--
文献类型:
--
作者:
M. I. Mallus;M. Schallwig;U. Kleinekathöfer

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退相过程基本上存在于量子力学发挥作用的所有应用中。这些应用当然包括生物系统中的激发能和电荷转移。在以前的研究中,我们分析了振动退相时间作为一个功能的能隙波动的一个大的分子模拟。在这项研究中,单个分子亚基是计算的重点。所研究的分子包括Fenna-Matthews-Olson和捕光系统2复合物中的细菌叶绿素以及PE 545聚集体中的胆色素。目前的工作扩展到整个复杂的研究,包括各自的分子间耦合。再次,可以得出结论,普遍和反比例存在于失相时间和激子能隙波动的方差之间,而相应的比例常数可以使用能隙自相关函数合理化。此外,这些发现可以扩展到更高的相邻激子态之间的间隙。
Dephasing processes are present in basically all applications in which quantum mechanics plays a role. These applications certainly include excitation energy and charge transfer in biological systems. In a previous study, we have analyzed the vibrational dephasing time as a function of energy gap fluctuation for a large set of molecular simulations. In that investigation, individual molecular subunits were the focus of the calculations. The set of studied molecules included bacteriochlorophylls in Fenna–Matthews–Olson and light-harvesting system 2 complexes as well as bilins in PE545 aggregates. The present work extends this study to entire complexes, including the respective intermolecular couplings. Again, it can be concluded that a universal and inverse proportionality exists between dephasing time and variance of the excitonic energy gap fluctuations, whereas the respective proportionality constants can be rationalized using the energy gap autocorrelation functions. Furthermore, these findings can be extended to the gaps between higher-lying neighboring excitonic states.
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影响因子: 5.7
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