Superposition Assumption. II. High Density Fluid Argon

Abstract

The triplet correlation function for high density fluid argon was calculated by the Monte Carlo (MC) method with a truncated cube as the basic box. This new box provides us a longer range for the triplet function than the conventional cubic box using the same number of particles; it also provides us better statistics for the same computing time. The MC g⁽³⁾ at ρ^* = 0.80 was found to be very different from the SA prediction. Upon substituting both MC g⁽³⁾ and SA g⁽³⁾ into the Born‐Green equation, it is found that the result is fair for MC g⁽³⁾ but very poor for the SA one. We conclude that the Superposition Assumption (SA) is poor at high density.