Abstract
Closed analytical expressions for the structure factor of simple monatomic liquids have been obtained using the double Yukawa potential function in the random phase approximation (RPA) together with the Weeks, Chandler, and Andersen (WCA) criterion for the division of the pair potential. Isothermal compressibility of liquids have been derived in the extended random phase approximation (ERPA). The results for the structure factor and compressibility are found to be in excellent agreement with experimental data. Compressibility values in the RPA and ERPA are almost identical, indicating that the ERPA does not represent any significant improvement over the RPA, at least for this particular long wave property.
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