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28 March 2024
 
  » pubmed » pmid15524822

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Electron-vibron coupling in high-resolution X-Ray absorption spectra of organic materials: NTCDA on Ag(111)
A Schöll ; Y Zou ; L Kilian ; D Hübner ; D Gador ; C Jung ; S G Urquhart ; Th Schmidt ; R Fink ; E Umbach ;
Date 1 Oct 2004
Journal Phys Rev Lett, 93 (14), 146406
AbstractWe 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.
Source PubMed, pmid15524822
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