The general traits of inelastic electron scattering by the adsorbed   system
  Inelastic electron scattering by the adsorbate covered Pt(100) single crystal surface is studied by Disappearance Potential Spectroscopy and density of states (DOS) calculations. Two peculiar channels of elastic electron consumption are highlighted, both related to the substrate core level excitation coupled separately with two particular electron transitions. The first channel affects the adsorbed layer and enables to reveal the valence state structure of the adsorbed species as well as the substrate DOS. The second one includes the multiple plasmon oscillations. The proposed mechanism of electron transitions assumes that one-dimensional DOS at the vacuum level is an additional spot for location of excited electrons, along with vacant DOS at the Fermi level. Observed phenomena are supposed to be a general regularity of electron-solid interaction and a useful tool for fingerprinting the adsorbed layer at molecular level. 
A. R. Cholach and V. M. Tapilin
cond-mat.mtrl-sci physics.chem-ph