Susceptibilities of liquid–vapor interface of simple liquids

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Abstract
Quantities related to two-point correlation function in the inhomogeneous interfacial zone of a planar liquid–vapor interface are determined from molecular dynamics simulations for a Lennard-Jones liquid at equilibrium with its vapor at the reduced temperature kT/ε=1.0. Susceptibilities and density fluctuations in planes parallel to the interface are reported. Stabilization of the liquid slab surrounded by vapor, by an external potential, is also discussed. Qualitative agreement was found for the contribution predicted from capillary-wave theory—in contrast to the case of liquid–liquid interface at low temperature, where fully quantitative agreement was obtained.