Abstract

In this study, by means of a theoretical model for the direct correlation function (DCF), the low- k behavior of the static structure factor, S ( k ), is predicted for xenon fluid at the supercritical temperature and low density states. The results obtained are compared with the small-angle neutron scattering (SANS) measurements carried out by Formisano et al. [Phys. Rev. E 58 (1998) 2648]. Good agreement was found between semianalytic calculations and the experimental results obtained for the structural fluctuation gave a clear indication of the efficiency of applied model conjugated with an effective pair potential in the case of pairwise additivity approximation. In fact, the contribution of many-body interactions was taken into account in the model by defining an effective pair potential, the intermolecular parameters of which are dependent on the thermodynamic states. The density fluctuation and long-range correlation length, ξ, which are closely related to many physico-chemical properties of supercr...

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