title: Two-dimensional phase behavior of a bimolecular porphyrin system at the solid-vacuum interface.
abstract: The "in vacuo" self-assembly of a two-component porphyrin system on a metal surface is studied by means of scanning tunneling microscopy in the sub-monolayer regime. The observed self-assemblies are systematically analyzed by their dependence on the total coverage and on the ratio of the two components resulting in a two-dimensional phase diagram. In a small region within the parameter space, a mixed surface layer is observed. The results are discussed consistently on the basis of molecule-surface and molecule-molecule interactions as well as thermodynamic aspects, leading to a qualitative comprehension of the phase behavior of the two-dimensional bimolecular system.
authors.affiliation: Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
authors.forename: Nikolai
authors.initials: N
authors.lastname: Wintjes
authors.forename: Jorge
authors.initials: J
authors.lastname: Lobo-Checa
authors.forename: Jens
authors.initials: J
authors.lastname: Hornung
authors.forename: Tomás
authors.initials: T
authors.lastname: Samuely
authors.forename: François
authors.initials: F
authors.lastname: Diederich
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Jung