The physics and chemistry of conducting organic material has attracted considerable interest in the recent past. Conjugated organic molecules are a particularly interesting class of materials, due to their wide range of possible applications like light emitting devices, photodiodes, solar cells and also fully organic transistors and integrated circuits. One of the most promising approach for device fabrication is the production of crystalline organic thin films. However, the present know-ledge concerning the growth kinetics and the structure of these thin films is still in its infancy. The objective of this proposal therefore is the systematic investigation of the kinetics and energetics of adsorption of organic molecules on various surfaces. For this purpose we will apply surface science techniques like Thermal Desorption Spectroscopy (TDS), Low Energy Electron Diffraction (LEED) and X-Ray Photoelectron Spectroscopy (XPS). All the investigations will be performed under well defined Ultrahigh Vacuum (UHV) conditions. With respect to the adsor-bates we will focus on the oligo-phenylenes (p-terphenyl to p-sexiphenyl). These molecules will be adsorbed on more or less reactive single crystal metal surfaces (Au, Cu, Ni, Pd), but also on nonmetallic surfaces like mica or semiconducting surfaces.