A knowledge of the bulk and surface structures of solid state materials is vital if both their physical and chemical properties are to be fully understood. This module will introduce students initially to the investigation of solid state structure, and then to the processes involved at gas-solid and liquid-solid interfaces. Part A will cover many of the experimental techniques and processes that are involved in the investigation and characterisation of solid state materials, probing both bulk and surface structure. The chemistry of the interface is key to many important processes and applications, such as catalysis, corrosion protection, electrochemistry, stabilising emulsions (e.g. in paints or in food), wetting phenomena and nanotechnology. To exploit these, it is vital to understand the fundamental interactions and processes occurring at the interface. Parts B and C focus on interfaces where one phase is a solid. They will cover the structures of solid surfaces and interactions of molecules with solid surfaces: the energies and kinetics involved and the tools used to study surface structures and reactions. This is followed by a description of different reaction mechanisms and important catalytic reactions.