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The role that occupied $d$ bands play in the inelastic lifetime of bulk andsurface states in Ag is investigated from the knowledge of the quasiparticleself-energy. In the case of bulk electrons, $sp$ bands are taken to befree-electron like. For surface states, the surface band structure of $sp$states is described with the use of a realistic one-dimensional hamiltonian.The presence of occupied $d$ states is considered in both cases by introducinga polarizable background. We obtain inelastic lifetimes of bulk electrons thatare in good agreement with first-principles band-structure calculations. Oursurface-state lifetime calculations indicate that the agreement with measuredlifetimes of both crystal-induced and image-potential induced surface states onAg(100) and Ag(111) is considerably improved when the screening of $d$electrons is taken into account.Comment: 9 pages, 9 figures, to appear in Phys. Rev.

Role of occupieddbands in the dynamics of excited electrons and holes in Ag