Interacting depolarizable adatoms on a triangular lattice - A model for alkali metal adsorption on fcc (111) and hcp (0001) surfaces

[摘要] We investigate the phase diagram of adsorbed dipoles on a triangular lattice by means of Monte Carlo simulation. Our model incorporates depolarization and multiplicity of binding sites, effects thought to be important for describing the adsorption of alkali metal atoms on metal surfaces. We successfully reproduce several important features of alkali-metal absorption systems including: the characteristic saturation in the work function decrease with coverage and the condensation behavior resulting from depolarization. We consider the T=0 behavior for the general case and present the full condensation phase diagram for one set of parameters. (C) 1997 Elsevier Science B.V.

[发布日期] 1997-10-23

[关键词] adsorption isotherms;alkali metals;computer simulations;surface electronic phenomena;surface thermodynamics;work function measurements