Electron-vibron coupling in high-resolution X-ray absorption spectra of organic materials: NTCDA on Ag(111)
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...
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| Veröffentlicht in: | Physical review letters 2004-10, Vol.93 (14), p.146406.1-146406.4, Article 146406 |
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| container_end_page | 146406.4 |
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| container_issue | 14 |
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| container_title | Physical review letters |
| container_volume | 93 |
| creator | SCHÖLL, A ZOU, Y KILIAN, L HÜBNER, D GADOR, D JUNG, C URQUHART, S. G SCHMIDT, Th FINK, R UMBACH, E |
| description | 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. |
| doi_str_mv | 10.1103/physrevlett.93.146406 |
| format | Article |
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| source | American Physical Society Journals |
| subjects | Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Lattice dynamics Phonons in low-dimensional structures and small particles Physics |
| title | Electron-vibron coupling in high-resolution X-ray absorption spectra of organic materials: NTCDA on Ag(111) |
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