Ultrashort laser-induced electron photoemission: a method to characterize metallic photocathodes

The photoemission properties of metallic photocathodes are studied by a time-resolved single-photon laser technique in the femtosecond regime. Experimental results obtained for different metals (Au, Cu, W, Al, Fe) are interpreted by a theoretical model, taking into account electron-electron and electron-phonon dynamics during the illumination by ultrashort, high-intensity ultraviolet laser pulses. This model points out the physical process of ultrashort photoemission from metals and the correlation of microscopic transient effects with macroscopic steady-state characteristics.