Vibronic Coupling and Excitation Transfer in Hydrogen-Bonded Molecular Dimers: A Quantum Dynamical Analysis.

Vibronic Coupling and Excitation Transfer in Hydrogen-Bonded Molecular Dimers: A Quantum Dynamical Analysis.
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氢键分子二聚体中的电子振动耦合和激发传递:量子动力学分析

DOI:
10.1021/acs.jpca.9b04903
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发表时间:
2019
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
H. Koppel
H. Koppel
中科院分区:
--
文献类型:
--
作者:
S. Goswami;S. Kopec;H. Koppel

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一个简短的教学重新推导基本激子耦合理论,采取核坐标是固定的。然后,这是扩展到考虑到这些坐标的变化,通过采用合适的多模耦合模型和提取的局部激发态的人口的激发能量的转移。因此,定义的动力学问题是在一个完全量子的方式数值求解。选择了两个具有双氢键的芳香杂环体系作为代表性的例子,利用从头算方法对它们的电子激发光谱进行了分析,发现与实验符合较好,电子布居的数值计算揭示了激发转移的复杂时间依赖性,远不是振荡或指数的.对于本地化的激发,短时间的行为可以理解的淬火激子能量分裂,而离域激发的复杂的时间依赖性与快速变化的功能的结果。其中一些可以解释的振动结构的激发光谱。猝灭激子分裂的激发能量转移的短时行为的重要性被强调。
A brief pedagogic rederivation is given of basic exciton coupling theory, taking the nuclear coordinates to be fixed. This is then extended to take variations of these coordinates into account by adopting suitable multimode coupling models and extracting the transfer of excitation energy from the populations of the locally excited states. The dynamical problem thus defined is solved numerically in a fully quantal manner. Two doubly hydrogen bonded dimers of (hetero)aromatic systems are selected as representative cases whose electronic excitation spectra have been analyzed previously based on ab initio data, and good agreement with experiment has been found. The numerical calculations of the electronic populations reveal a complex time dependence of the excitation transfer that is far from being oscillatory or exponential. For localized excitation, the short-time behavior can be understood in terms of the quenched excitonic energy splitting, while for delocalized excitation a complex time dependence with rapidly changing features results. Some of these can be interpreted in terms of the vibronic structure of the excitation spectra. The importance of the quenched excitonic splitting for the short-time behavior of the excitation energy transfer is emphasized.
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