The molecular structure of a liquid–vapor interface: Comments on the integral equation approach

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Abstract
A review of attempts to obtain interfacial density profiles by integral equation methods is presented. The first equation of the Yvon–Born–Green hierarchy is solved for ρ(1)(z) for the vapor–liquid interface, using square‐well g(2)(r) data input generated by solving the second equation of the Yvon–Born–Green hierarchy. The method used in solving the first equation is discussed. Profiles are presented for three reduced temperatures spanning the vapor–liquid coexistence locus. The properties surface tension and surface excess internal energy are computed using statistical mechanical formulae and the ρ(1)(z) and g(2)(r) data generated.