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首页> 外文期刊>The Journal of Chemical Physics >EXCITONIC INTERACTIONS AND EXCIMER FORMATION IN PURE AND MIXED CLUSTER ISOTOPOMERS OF NAPHTHALENE
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EXCITONIC INTERACTIONS AND EXCIMER FORMATION IN PURE AND MIXED CLUSTER ISOTOPOMERS OF NAPHTHALENE

机译：萘的纯和混合簇同分异构体的激发相互作用和准分子形成

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The nature of electronic excitation and subsequent excited-state dynamics in small naphthalene clusters has been elucidated using isotope labeling techniques. The S-1 <-- S-0 spectra of tetramer isotopomers are characterized by structurally inequivalent site splitting which is induced by an exciton interaction in the S-2 State through vibronic coupling. It is suggested that the tetramer involves a pair of nearly overlapped chromophores, which is responsible for the excitonic interaction, and other two chromophores acting as solvents. An excitonic state originating in this pair is proposed to correlate with the lowest excimer state of the cluster as the interplanar separation and dihedral angle are reduced. In contrast, the spectra of trimer isotopomers are analyzed by invoking a symmetric geometry in which three chromophores are less overlapped and thus give rise to weak excitonic effects. The isomerization dynamics of these clusters is discussed in terms of a vibrationally activated process which makes the cluster framework wobble, allowing for stronger exciton interaction. (C) 1995 American Institute of Physics. [References: 33]
机译：使用同位素标记技术已经阐明了在小型萘簇中电子激发的性质以及随后的激发态动力学。四聚体同位异构体的S-1 <-S-0光谱的特征是结构上不等价的位点分裂，这是由S-2状态中的激子相互作用通过振动耦合引起的。建议四聚体涉及一对几乎重叠的生色团，其负责激子相互作用，而另两个生色团充当溶剂。随着平面间距和二面角的减小，提出了这一对中的激子态与团簇的最低准分子态相关。相反，通过调用对称几何结构来分析三聚体异构体的光谱，在该对称几何结构中，三个生色团的重叠较少，从而引起弱的激子效应。这些团簇的异构化动力学是通过振动激活过程来讨论的，该过程使团簇框架摆动，从而允许更强的激子相互作用。 （C）1995年美国物理研究所。 [参考：33]

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