Abstract
The behavior of core 01s levels for low-coordinated (3, 4, 5) oxygen ions on the surface and in the bulk of magnesium oxide has been studied. Mg13O142− and Mg14O132+ clusters have been calculated by the SCF MS Xα method. Binding energies of 1s oxygen states are found to decrease with lowering coordination. This dependence on coordination is attributed to the larger changes in Madelung potential compared to those of pure electron contributions to the binding energy of electrons in oxygen ion. The coordination dependence of ion oxygen charges and relaxation energies is also discussed.
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