Experimental study of the triplet correlation function for simple liquids

A new quantity, the isothermal pressure derivative of the liquid structure factor, is introduced into the distribution function theory of simple liquids. It is shown how the triplet correlation function and certain other quantities may be expressed in terms of this experimental quantity and the usual liquid structure factor. From experimental measurements of the liquid structure factor and its pressure derivative in rubidium, carbon tetrachloride and argon, the authors have studied the triplet correlation function and, where possible, measured its range. In addition the Born-Green, hypernetted chain and Percus-Yevick equations are written as relationships between the structure factor and its pressure derivative.