Abstract
Bombardment of surfaces by low energy (20–1000 eV) electrons causes electronic excitations that can result in the desorption of ionic and neutral atoms and molecules from the surface layer. The mechanisms of electron stimulated desorption of ions and neutrals will be discussed, and the uses and limitations of electron stimulated desorption ion angular distributions (ESDIAD) for determining local structure of surface molecules will also be described. ESDIAD is useful as a structural tool because the direction of ion desorption is determined by the orientation of the surface bond which is ruptured by the excitation. Examples to be discussed include the influence of surface ‘additive’ atoms (e.g. O, Br, K) on the local structure of NH 3, H 2O and CO adsorbed on transition metal surfaces.
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