%0 Journal Article
%A Wagner, C.
%A Kasemann, D.
%A Golnik, C.
%A Forker, R.
%A Esselinger, M.
%A Müllen, K.
%A Fritz, T.
%T Repulsion between molecules on a metal: Monolayers and submonolayers of hexa-peri-hexabenzocoronene on Au(111)
%J Physical review / B
%V 81
%N 3
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-10251
%P 035423
%D 2010
%Z Financial support by Deutsche Forschungsgemeinschaft (DFG) Grants No. FR875/9 and No. FR875/11 is gratefully acknowledged.
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000274002300113
%R 10.1103/PhysRevB.81.035423
%U https://juser.fz-juelich.de/record/10251