A Monte Carlo study of surface diffusion coefficients in the presence of adsorbate–adsorbate interactions. II. Attractive interactions

摘要: Chemical, jump, and tracer diffusion coefficients D, Dj, D*, respectively, have been determined by Monte Carlo simulations on a square lattice for the case of nearest‐neighbor attractive interactions. D was fluctuation autocorrelation method Kubo–Green equation, using values 〈(δN)2〉/〈N〉 from isotherms. can only be above Tc and, this situation, two methods yield identical within error simulations. Distinct high‐ low‐T regimes are observed, because changes in with T, much higher activation energies prefactors T/Tc 1.4. For D* Dj smaller effects seen. The numerical suggest that diffusing atoms either isolated dilute gas or those which become detached corners close‐packed (1×1) islands below Tc, but complement dense Tc.