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Abstract: J. Electr. Spectrosc. 195, 263 (2014)


Formation of Metal-Organic Interface States studied with 2PPE

M. Marksa, A. Schöllb,c, and U. Höferd,e

aDepartment of Chemistry, Columbia University, New York, New York 10027, United States
bUniversität Würzburg, Experimentelle Physik VII and Röntgen Research Center for Complex Material Systems (RCCM), D-97074 Würzburg, Germany
cKarlsruher Institut für Technologie KIT, Gemeinschaftslabor für Nanoanalytik, 76021 Karlsruhe, Germany
dFachbereich Physik und Zentrum für Materialwissenschaften, Philipps-Universität Marburg, D-35032 Marburg, Germany
eDonostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain

 

Abstract

Experimental and theoretical investigations on the formation mechanism of interface-specific electronic states at metal-organic interfaces are reviewed. Model systems discussed are thin films of 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA) and 1,4,5,8-naphthalene-tetracarboxylic acid dianhydride (NTCDA) on the silver single crystal surfaces Ag(111) and Ag(100). Time and angle-resolved two-photon photoemission (2PPE) reveals the occurrence of unoccupied electronic states that have no counterpart in the bulk metal or the organic overlayer. The interface states resemble Shockley-surface states of clean metals. They are strongly dispersive and show an ultra-short lifetime in the range of tens to hundred femtoseconds. The energy position of the interface states is to a large extent determined by the adsorption height of the molecules and their local surface density while the wave function experiences a strong influence from the adsorption geometry of the molecules.

 

Reprint (PDF) (© Elsevier)
DOI: 10.1016/j.elspec.2014.02.009

 

Zuletzt aktualisiert: 09.03.2015 · armbrusn

 
 
 
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