MODELING OF AN ORDER-DISORDER TRANSITION IN ADSORBED FILMS BY THE MONTE CARLO METHOD.

Mathematical modeling of an order-disorder transition in adsorbed films on the (110) face of a bcc crystal was performed by the Monte Carlo method on a BESM-6 computer, allowing for the dipole-dipole interaction between the adsorbed atoms. The calculations were carried out for an adsorbed atom concentration four times lower than the concentration of the adsorption centers. A comparison of the calculated results with the experimental data for the Na-W(110) system left bracket V. K. Medvedev, A. G. Naumovets, and A. G. Fedorus, Fiz. Tverd. Tela (Leningrad) 12, 375 (1970) right bracket demonstrated that allowance for the dipole-dipole interaction of the adsorbed atoms explained the symmetry of a two-dimensional lattice of a sodium film on the W(110) face, obtained for this concentration, as well as the value of the disordering temperature.