Superposition Assumption. II. High Density Fluid Argon

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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.

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