Structure of Liquids. III. An X-Ray Diffraction Study of Fluid Argon

X-ray diffraction measurements were made on argon at 13 states in the general critical region on a density—temperature grid covering the range 0.280 g/cc⩽ρ̄⩽0.982 g/cc and −130°C≤T≤−110°C. Features of the intensity patterns vary rather simply with density and only weakly with temperature. Computed values of the radial distribution functions show similar dependence on T and ρ̄. The first three maxima in the distribution functions are at average locations of 3.90, 7.51, and 10.9 Å.