Femtosecond photoemission studies of the transient electron temperature in supported metal nanoparticles

Double excitation of the surface plasmon with 388 nm (3.2 eV) femtosecond radiation allows to distinguish photoemission from silver nanoparticles and substrate . We apply time-resolved photoemission to measure the electron temperature in the nanoparticles subsequent to excitation with a 776 nm (1.6 eV) femtosecond pulse.