We make use of discipline emission resonance (FER) to watch the Smoluchowski impact on Ag(100) and Cu(100) surfaces, which is a cost switch phenomenon, resulting in electrical dipole formation at floor steps. On Ag(100), pronounced cost switch ends in a discontinuity in FER energies at step websites. In distinction, this discontinuity is absent on Cu(100), indicating that the Smoluchowski impact is negligible. Density practical principle calculations confirms this important distinction in cost switch on the step. By analyzing FER energies utilizing the triangular potential mannequin, we extract the spatial variation of the work operate across the step on each surfaces. Our outcomes for Cu(100) reveal {that a} discount within the work operate can happen even and not using a step electrical dipole, opposite to the broadly accepted rationalization that the Smoluchowski impact reduces the work operate. Moreover, whereas it’s typically accepted that as cost switch happens, native unfavorable (constructive) floor cost raises (lowers) the work operate, our outcomes for Ag(100) reveal the alternative pattern. Moreover, the extracted work operate permits spatially resolving the constructive and unfavorable cost densities inside a step electrical dipole, which has not but been achieved with different native probe methods.
