Tight-binding model of adsorbate structures

Tight-binding calculations are presented of the ground state energies of metal atoms absorbed on the surface of the same or similar metals. We consider rows and clusters of adsorbate, and find significant energy variations as a function of the number of the atoms. Results are presented for the (001) face both for fcc and bcc crystals. General results that are applicable for any elemental fcc or bcc crystal are obtained in the present paper. We include only s-wave tight-binding orbits in the nearest neighbor approximation. copyright 1999 The American Physical Society