Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Organic/bio Molecules on Metal Surfaces I

O 6.1: Vortrag

Montag, 11. März 2013, 10:30–10:45, H38

adsorption structure of PbPc on the surface Ag(111) — •peng jiang and michael hietschold — Chemnitz University of Technology, Institute of Physics, Solid Surface Analysis Group, D-09107 Chemnitz, Germany

We have investigated the adsorption of PbPc on Ag(111) surface. Using OMBE technology, ultrathin films of PbPc have been deposited on Ag(111) and annealed at 100°C for 20min. The ordered molecular arrangement is observed when the molecular film is close or more than one monolayer. We have found two different adsorption structures with molecular unit cells characterized by side lengths of 1.53nm*1.45nm and 1.61nm*1.37nm, and angles of 85° and 89° respectively. On Ag(111) surface we found the shuttle-cock shaped molecules are in both Pb -up and -down adsorption configurations forming the chess-board like pattern. The reversible flipping between molecular configurations on the surface recorded during the scanning process proposes a new mechanism to control the single-molecular adsorption configuration on Ag(111) surface. With a slightly thicker film the molecules on the second layer lie directly on top and have the same orientation of that from the first layer making a direct stack.