Liquid-vapor equilibrium and surface tension in Lennard-Jones systems

The thermodynamic parameters of coexisting phases, surface tension, the effective thickness of the transition layer, and the mean-square amplitude of capillary waves were calculated for two-phase models of 1024 and 4096 Lennard-Jones particles by the method of molecular dynamics. The calculations were performed with cutoff radii of interparticle interaction potentials r(c1) = 2.6 sigma and r(c2) = 6.78 sigma. It was shown that a correct description of two-phase system properties required selecting much larger potential cutoff radii than with single-phase models.