TY  - JOUR
AU  - Wagner, C.
AU  - Kasemann, D.
AU  - Golnik, C.
AU  - Forker, R.
AU  - Esselinger, M.
AU  - Müllen, K.
AU  - Fritz, T.
TI  - Repulsion between molecules on a metal: Monolayers and submonolayers of hexa-peri-hexabenzocoronene on Au(111)
JO  - Physical review / B
VL  - 81
IS  - 3
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-10251
SP  - 035423
PY  - 2010
N1  - Financial support by Deutsche Forschungsgemeinschaft (DFG) Grants No. FR875/9 and No. FR875/11 is gratefully acknowledged.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000274002300113
DO  - DOI:10.1103/PhysRevB.81.035423
UR  - https://juser.fz-juelich.de/record/10251
ER  -