Cycloaddition-like reactions at germanium (1 0 0) surfaces: Adsorption and reaction of 1,5-cyclooctadiene

The adsorption and reaction of 1,5-cyclooctadiene with the Ge(1 0 0) surface has been investigated. The subsequent surface reactions are followed by photoelectron spectroscopy and temperature programmed desorption. The bonding configuration is determined with photoelectron spectroscopy and compared with ab initio calculations. 1,5-Cyclooctadiene reacts with surface Ge dimers to form a four-membered ring structure at the surface at room temperature. Heating this surface results in some molecular desorption of 1,5-cyclooctadiene and the remaining surface species decompose at higher temperatures and desorb as either hydrocarbon species or molecular hydrogen.