S. Ustaze et al., ELECTRON-CAPTURE AND LOSS PROCESSES ON OXIDES AND OXIDIZED SURFACES, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 135(1-4), 1998, pp. 319-323
Electron capture and loss processes on MgO (1 0 0) and oxygen covered
Mg and Al surfaces are studied on the example of formation and destruc
tion of H-, O- and F- in atom/anion scattering. Electron capture is de
monstrated to occur very efficiently on MgO (1 0 0) and can be underst
ood in terms of a localised non-resonant capture mechanism between the
incident atom and a lattice O anion. Electron loss from incident nega
tive ions is observed and is attributed to loss to the conduction band
. Changes in capture rates on oxygen covered surfaces are studied from
the limit corresponding to chemisorption to oxide film formation. Ln
the chemisorption range capture is attenuated because of changes in th
e local density of states (LDOS) and in the positions and widths of th
e anion level near the adsorbate. (C) 1998 Elsevier Science B.V.