Perturbation Correction for the Free Energy and Structure of Simple Fluids
- 1 November 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 8 (5), 2548-2552
- https://doi.org/10.1103/physreva.8.2548
Abstract
Separation of an arbitrary potential into a short-range, repulsive part and a weak correction affords the possibility of describing the -system properties as corrections to the assumed-known reference system. We derive here an expression for such a correction of the classical Helmholtz free energy that is the analog of a result familiar from the development of the hypernetted-chain integral equation. Other corrections are obtained therefrom, including a corrected pair-distribution function proposed earlier. All results are easily adapted for numerical calculation.
Keywords
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