Methods (AG Schneider)
Scanning tunneling microscopy and spectroscopy
Our main experimental tool is the STM. Besides instruments that operate in ultra-high vacuum at room temperature we also have two instruments that work at liquid helium temperatures. These are dedicated to the investigation of electronic properties of surface and adsorbates by STS.
Low-energy electron diffraction
Whereas STM can at best help to identify surface structures a true analysis of the positions of the atoms at and near a surface needs to be done by a diffraction method. We use LEED combined with structural analysis of LEED intensity spectra to resolve the surface structure.
Density functional theory
We use density functional theory (DFT) as a tool to verify our structural analyses and to gain insight into the energetics and electronic properties of the systems.