Pair potential from neutron diffraction on argon at low densities

Abstract

We report the results of measurements of the static structure factor S(\ensuremath{\kappa}) for gaseous $^{36}\mathrm{Ar}$ at 140 K and four (subcritical) low densities from which, for the first time, we derive the well of the isotropic pair potential directly by means of a simple Fourier transform inversion.