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Electronic potential of a chemisorption interface

Autor Zhao, Jin; Pontius, Niko; Winkelmann, Aimo; Sametoglu, Vahit; Kubo, Atsushi; Borisov, Andrei G.; Sánchez-Portal, Daniel ; Silkin, Viatcheslav M.; Chulkov, Eugene V. ; Echenique, Pedro M. ; Petek, Hrvoje
Palabras clave Ab initio calculations
Adsorbed layers
Binding energy
Electronic structure
Interface states
Ionisation potential
Photoelectron spectra
[PACS] Electron states at surfaces and interfaces
Fecha de publicación 13-ago-2008
EditorAmerican Physical Society
Citación Phys. Rev. B 78, 085419 (2008)
ResumenChemisorption of atoms and molecules controls many interfacial phenomena such as charge transport and catalysis. The question of how the intrinsic properties of the interacting materials define the electronic structure of their interface remains one of the most important, yet intractable problems in surface physics. Through two-photon photoemission spectroscopy we determine a common binding energy of ~1.8–2.0 eV with respect to the vacuum for the unoccupied resonance of the ns valence electron of alkali atoms (Li-Cs) chemisorbed at low coverage (less than 0.1 monolayer) on noble metal [Cu(111) and Ag(111)] surfaces. We present a theoretical model based on the semiempirical potentials of the adsorbates and the substrates, their principal mode of interaction through the Coulomb interaction, and the ab initio adsorption structures. Our analysis reveals that atomic size and ionization potential independent interfacial electronic structure is a consequence of the Coulomb interaction among the ns electron, the alkali-atom ionic core, and the induced image charge in the substrate. We expect the same interactions to define the effective electronic potentials for a broad range of molecule/metal interfaces.
Descripción 7 pages, 4 figures.-- PACS nrs.: 73.20.-r.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.78.085419
URI http://hdl.handle.net/10261/8501
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