Neutron diffraction experiments on a fluid, equimolar mixture of methane and carbon tetrafluoride

Abstract

A neutron scattering investigation is reported on an equimolar mixture of methane and carbon tetrafluoride along the 370 K isotherm for four different thermodynamic states in a pressure range 270–800 bar, the aim of which was to provide more structural data about this non-ideal system. The fully corrected coherent differential cross-section is presented. The weighted sum of the total atom pair correlation functions is separated into the intramolecular and intermolecular contributions and the structural parameters of the molecules in the fluid state are determined. The density dependence of the intermolecular atom pair correlation functions is clearly visible. The experimental results are compared with previous experiments on the pure components and XRISM calculations, based on a one-centre Lennard-Jones potential.