Electron-vibron coupling in high-resolution X-Ray absorption spectra of organic materials: NTCDA on Ag(111).
Electron-vibron coupling in high-resolution X-Ray absorption spectra of organic materials: NTCDA on Ag(111).
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有机材料高分辨率 X 射线吸收光谱中的电子振动耦合：Ag(111) 上的 NTCDA。
DOI：
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发表时间：
2004
影响因子：
8.6
通讯作者：
E. Umbach
中科院分区：
文献类型：
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作者：
A. Schöll;Y. Zou;L. Kilian;D. Hübner;D. Gador;C. Jung;S. Urquhart;T. Schmidt;R. Fink;E. Umbach
以Ag（111）表面的NTCDA为例，我们报道了有机大分子高分辨率近边X射线吸收精细结构（NEXAFS）谱中额外丰富的精细结构。这些精细结构被完全解释为电子振动耦合到电子芯激发。耦合是模式选择性的，主要是一个振动模式耦合到每个激发。拟合的结果表明发生的Davydov分裂，首先观察到核心激子。形态的差异显着影响的电子-振动子耦合，表明强烈的分子间相互作用。因此，NEXAFS成为有机固体的更精细的探针。
We report additional rich fine structures in high-resolution near-edge x-ray-absorption fine structure (NEXAFS) spectra of large organic molecules using NTCDA on Ag(111) as an example. These fine structures are completely interpreted as vibronic coupling to electronic core excitations. The coupling is mode selective; predominantly one vibronic mode couples to each excitation. The fit results suggest the occurrence of a Davydov splitting, first observed for core excitons. Morphological differences substantially influence the electron-vibron coupling, indicating a strong intermolecular interaction. Thus NEXAFS becomes a more subtle probe for organic solids.