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Abstract: Phys. Rev. B 84, 081301 (2011)

Energy shift and wave function overlap of metal-organic interface states

M. Marks1, N. L. Zaitsev2,3, B. Schmidt1, C. H. Schwalb1, A. Schöll4, I. A. Nechaev3,5, P. M. Echenique2,6,
E. V. Chulkov2,6 and U. Höfer1,2

1 Fachbereich Physik und Zentrum für Materialwissenschaften, Philipps-Universität, D-35032 Marburg, Germany
2 Donostia International Physics Centre (DIPC), 20018 San Sebastián, Spain
3 Tomsk State University, 634050, Tomsk, Russia
4 Universität Würzburg, Experimentelle Physik VII and Röntgen Center (RCCM), 97074 Würzburg, Germany
5 Nekrasov Kostroma State University, 156961 Kostroma, Russia
6 Departamento de Fisica de Materiales, UPV/EHU and CFM - MPC, Centro Mixto CSIC - UPV/EHU, 20080 San Sebastián, Spain



The properties of Shockley-type interface states between π-conjugated organic molecular layers and metal surfaces are investigated by time-resolved two-photon photoemission experiments and density functional theory. For perylene- and naphthalene-tetracarboxylic acid dianhydride (PTCDA and NTCDA) adsorbed on Ag(111), a common mechanism of formation of the interface state from the partly occupied surface state of the bare Ag(111) is revealed. The energy position is found to be strongly dependent on the distance of the molecular carbon rings from the metal and their surface density. Bending of the carboxyl groups enhances the molecular overlap of the interface state.


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DOI: 10.1103/PhysRevB.84.081301

Last modified: 12.03.2015 · armbrusn

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