Observation of a molecule-metal interface charge transfer related feature by resonant photoelectron spectroscopy
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- We report the discovery of a charge transfer (CT) related low binding energy feature at a molecule-metal interface by the application of resonant photoelectron spectroscopy (RPES). This interface feature is neither present for molecular bulk samples nor for the clean substrate. A detailed analysis of the spectroscopic signature of the low binding energy feature shows characteristics of electronic interaction not found in other electron spectroscopic techniques. Within a cluster model description this feature is assigned to a particularWe report the discovery of a charge transfer (CT) related low binding energy feature at a molecule-metal interface by the application of resonant photoelectron spectroscopy (RPES). This interface feature is neither present for molecular bulk samples nor for the clean substrate. A detailed analysis of the spectroscopic signature of the low binding energy feature shows characteristics of electronic interaction not found in other electron spectroscopic techniques. Within a cluster model description this feature is assigned to a particular eigenstate of the photoionized system that is invisible in direct photoelectron spectroscopy but revealed in RPES through a relative resonant enhancement. Interpretations based on considering only the predominant character of the eigenstates explain the low binding energy feature by an occupied lowest unoccupied molecular orbital, which is either realized through CT in the ground or in the intermediate state. This reveals that molecule-metal CT is responsible for this feature. Consequently, our study demonstrates the sensitivity of RPES to electronic interactions and constitutes a new way to investigate CT at molecule-metal interfaces.…
Autor(en): | C Sauer, M Wießner, A Schöll, F Reinert |
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URN: | urn:nbn:de:bvb:20-opus-148672 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Fakultät für Physik und Astronomie / Physikalisches Institut |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | New Journal of Physics |
Erscheinungsjahr: | 2015 |
Band / Jahrgang: | 17 |
Heft / Ausgabe: | 043016 |
Originalveröffentlichung / Quelle: | New Journal of Physics 17:043016 (2015). DOI: 10.1088/1367-2630/17/4/043016 |
DOI: | https://doi.org/10.1088/1367-2630/17/4/043016 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Freie Schlagwort(e): | NEXAFS spectroscopy; absorption; ce compounds; charge transfer; energy; interface; model calculation; organic thin films; photoemission; resonant photoelectron spectroscopy; states; transfer dynamics |
Datum der Freischaltung: | 15.11.2018 |
Lizenz (Deutsch): | CC BY: Creative-Commons-Lizenz: Namensnennung |