Role of occupied d states in the relaxation of hot electrons in Au

We present first-principles calculations of electron-electron scattering ra tes of low-energy electrons in Au. Our full band-structure calculations ind icate that a major contribution from occupied d states participating in the screening of electron-electron interactions yields lifetimes of electrons in Au with energies of 1.0-3.0 eV above the Fermi level that are larger tha n those of electrons in a free-electron gas by a factor of similar to 4.5. This prediction is in agreement with a recent experimental study of ultrafa st electron dynamics in Au(111) films [J. Cao er al., Phys. Rev. B 58, 10 9 48 (1998)], where electron transport has been shown to play a minor role in the measured lifetimes of hot electrons in this material.