Density profiles for dimerizing fluid near a permeable surface

A model of an associating fluid in contact with a penetrable surface is studied. This model associating fluid permits dimerization of the fluid species. The fluid-surface interaction is considered as an external field in the form of a Gaussian barrier. The density profiles of the particles are evaluated in the framework of the singlet level theory for inhomogeneous fluids. We use the HNC1 approximation to describe the adsorption and penetration of the associated fluid into the barrier. A model of a composite surface consisting of a hard wall and a potential barrier is investigated also. The models can be used to generate adlayers of specific structure.