Probing chemical dynamics at surfaces

An account is given of recent progress concerning chemical reaction dynamic s at surfaces. The goal is to elucidate the reaction dynamics at the molecu lar level, both as time and distance is concerned. The methods of study inc lude molecular beam scattering, scanning tunnelling microscopy, and (femtos econd) laser spectroscopy. Systems studied include elementary interactions of NO, CO, and O-2 at single crystal metal surfaces.