Journal
SURFACE SCIENCE
Volume 621, Issue -, Pages 64-68Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2013.10.020
Keywords
Phthalocyanine; Silver; Molecular orbitals; Photoelectron momentum microscopy
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Funding
- Deutsche Forschungsgemeinschaft [GRK 1221, RE1469/9-1]
- Bundesministerium fur Bildung und Forschung [03SF0356B]
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We present a comprehensive study of the adsorption behavior of iron phthalocyanine on the low-index crystal faces of silver. By combining measurements of the reciprocal space by means of photoelectron momentum mapping and low energy electron diffraction, the real space adsorption geometries are reconstructed. At monolayer coverage ordered superstructures exist on all studied surfaces containing one molecule in the unit cell in case of Ag(100) and Ag(111), and two molecules per unit cell for Ag(110). The azimuthal tilt angle of the molecules against the high symmetry directions of the substrate is derived from the photoelectron momentum maps. A comparative analysis of the momentum patterns on the substrates with different symmetry indicates that both constituents of the twofold degenerate FePc lowest unoccupied molecular orbital are occupied by charge transfer from the substrate at the interface. (C) 2013 Elsevier B.V. All rights reserved.
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