Abstract
The adsorption of perfluoropentacene (PFP) on the Cu(110) surface has been investigated using reflectance difference spectroscopy (RDS), low-energy electron diffraction, and low-temperature scanning tunneling microscopy. The PFP molecules within the first monolayer align their long molecular axis exclusively oriented along the [001] azimuthal direction of the Cu substrate. In comparison with the adsorption behavior of pentacene on the same surface, a strong effect of the fluorination regarding the molecular orientation and the intermolecular and molecule-substrate interactions was identified. Furthermore, a two-dimensional gas-solid phase transition accompanied by a reversible azimuthal rotation of the PFP molecules was observed at the beginning of the second monolayer growth. The change of the optical anisotropy associated with this reorientation was used to explore the two-dimensional (2D) condensation as a function of coverage and temperature by RDS, and the 2D heat of condensation in the PFP bilayer on Cu(110) was determined to be 105 meV.
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