  The adsorption of oxygen on the Ag(001) is investigated by means of density
functional techniques. Starting from a characterization of the clean silver
surfaces oxygen adsorption in several modifications (molecularly, on-surface,
sub-surface, Ag$_2$O) for varying coverage was studied. Besides structural
parameters and adsorption energies also work-function changes, vibrational
frequencies and core level energies were calculated for a better
characterization of the adsorption structures and an easier comparison to the
rich experimental data.
