Abstract
It is shown that the radial distribution function (RDF) of liquid argon is described quantitatively in terms of the quasi-crystalline model of liquids (crystal lattice with the lattice sites smeared out by Gaussian distributions) under the following conditions:
1) The model is based on the BCC lattice
2) The dispersion of the Gaussian distributions depends linearly on the radius of the coordination sphere.
3) The initial lattice is dilated isotropically with the exception of the first sphere.
Empirical methods of determination of the dispersion law are proposed which show that the dispersion law is not simple for liquid argon described on the basis of the FCC and HCP lattices. The regularities found allow one to treat liquid argon as an irregular atom packing with a random distribution of local compressions and expansions but with a regular alternation of the coordination spheres at large distances (packing order).