Journal Article

PreJuSER-10251

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Repulsion between molecules on a metal: Monolayers and submonolayers of hexa-peri-hexabenzocoronene on Au(111)

Wagner, C.FZJ* ; Kasemann, D. ; Golnik, C. ; Forker, R. ; Esselinger, M. ; Müllen, K. ; Fritz, T.

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10982  doi:10.1103/PhysRevB.81.035423

Abstract: We investigate the growth of hexa-peri-hexabenzocoronene (HBC) on Au(111) for monolayer (ML) and sub-ML coverage by scanning tunneling microscopy and low-energy electron diffraction. A transition from a disordered isotropic phase at low coverage to a highly ordered phase with a coverage-dependent lattice constant at higher coverage is found and attributed to a repulsive intermolecular force. To deduce the origin of this repulsion a model is set up, containing the Coulomb interaction between molecules and between localized dipoles from the push-back effect, as well as the intermolecular van der Waals potential. The modeling of the van der Waals interaction is done on a force field level. We find that the observed repulsion can only be explained when assuming a certain screening of the attractive London forces by the presence of the metal substrate.

Keyword(s): J

Note: Financial support by Deutsche Forschungsgemeinschaft (DFG) Grants No. FR875/9 and No. FR875/11 is gratefully acknowledged.

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Contributing Institute(s):

1. Grenz- und Oberflächen (IBN-3)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2010

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