On the nonuniform electron-density distribution in a layer adsorbed on a metal

The probability of a transition from a uniform charge distribution (UCD) in the adsorbed layer to a nonuniform one (NCD) caused by the dipole-dipole adatom repulsion is analyzed within the Anderson-Newns Hamiltonian and a simple density-of-states model for the substrate. Two limiting cases are considered, namely, an infinitely wide and a narrow band of allowed substrate states. Criteria for the UCD→NCD transition are obtained. Experimental data on reconstruction of clean metal faces are analyzed. Fiz. Tverd. Tela (St. Petersburg) 41, 1543–1547 (September 1999)