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First-principle calculations and angle-resolved photoemission experiments are combined to analyze the different contributions to the surface-state hole dynamics at the Be(0001) surface. The computed inelastic electron-electron scattering rate γ is in good agreement with experiment once the electron-phonon contribution is subtracted. γ is strongly influenced by details of the surface band structure. In particular, the intraband transitions within the surface state itself ignored in traditional Fermi liquid theory contribute 65%-85% to γ. This intraband contribution and the highly spatial nonlocality of the self-energy makes the energy and momentum dependence of γ to be ∝(EF-E)α (with α<2) in contrast to the observed α≅2 value in noble and transition metal surfaces.We acknowledge support by the Basque Country University, Basque Hezkuntza Saila, Spanish MEC, HPRN-CT-2000-00167 (NANOPHASE), and the Max Planck Research Award funds.Peer Reviewe

Surface-state hole decay mechanisms: The Be(0001) surface