Quasi-chemical Theory for the Statistical Thermodynamics of the Hard Sphere Fluid
| dc.creator | Pratt, Lawrence R. | |
| dc.creator | LaViolette, Randall A. | |
| dc.creator | Gomez, Maria A. | |
| dc.creator | Gentile, Mary E. | |
| dc.date | 2001-04-05 | |
| dc.date.accessioned | 2026-07-07T05:45:40Z | |
| dc.date.available | 2026-07-07T05:45:40Z | |
| dc.description | We develop a quasi-chemical theory for the study of packing thermodynamics in dense liquids. The situation of hard-core interactions is addressed by considering the binding of solvent molecules to a precisely defined `cavity' in order to assess the probability that the `cavity' is entirely evacuated. The primitive quasi-chemical approximation corresponds to a extension of the Poisson distribution used as a default model in an information theory approach. This primitive quasi-chemical theory is in good qualitative agreement with the observations for the hard sphere fluid of occupancy distributions that are central to quasi-chemical theories but begins to be quantitatively erroneous for the equation of state in the dense liquid regime of $ρd^3>$0.6. How the quasi-chemical approach can be iterated to treat correlation effects is addressed. Consideration of neglected correlation effects leads to a simple model for the form of those contributions neglected by the primitive quasi-chemical approximation. These considerations, supported by simulation observations, identify a `break away' phenomena that requires special thermodynamic consideration for the zero (0) occupancy case as distinct from the rest of the distribution. A empirical treatment leads to a one parameter model occupancy distribution that accurately fits the hard sphere equation of state and observed distributions. | |
| dc.description | 9 pages, 8 figures | |
| dc.identifier | https://arxiv.org/abs/physics/0104025 | |
| dc.identifier | http://arxiv.org/abs/physics/0104025 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/84074 | |
| dc.subject | Chemical Physics | |
| dc.title | Quasi-chemical Theory for the Statistical Thermodynamics of the Hard Sphere Fluid | |
| dc.type | text |