Probing photoinduced charge transfer at atomically smooth metal surfaces using surface enhanced Raman scattering

The chemical mechanism of surface enhanced Raman scattering (SERS) is used as a probe of photoinduced charge transfer at atomically smooth, single cry stal copper and silver surfaces in ultrahigh vacuum. The combination of SER S with electron energy loss spectroscopy (EELS) provides a great deal of in sight into the spatial extent, transition moment, and excited state potenti al energy surfaces of these excitations. These experiments and simulations are demonstrated to be: sensitive probes of local electronic structure at m etal surfaces.