Spectrum of electronic excitations due to the adsorption of atoms on   metal surfaces
  The time-dependent, mean-field Newns-Anderson model for a spin-polarised adsorbate approaching a metallic surface is solved in the wide-band limit. Equations for the time-evolution of the electronic structure of the adsorbate-metal system are derived and the spectrum of electronic excitations is found. The behaviour of the model is demonstrated for a set of physically reasonable parameters. 
M. S. Mizielinski, D. M. Bird, M. Persson and S. Holloway