Molecular-dynamics studies of charge complexes in liquid helium

Molecular-dynamics simulations were employed to describe the solid-liquid p hase transition of charge complexes in helium films. These two-dimensional atomic-like states, called diplons, arise from the coupling between surface electrons on helium film and positive ions localized in the helium film-su bstrate interface. The effects of the distance between the helium film and the substrate on the structural properties of the diplon system are investi gated. The melting temperature was determined by analyzing quantities like the total energy per particle, the self-diffusion coefficient, and the pair correlation function. (C) 1999 Elsevier Science B.V. All rights reserved.