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Reexamination of Van Der Waals model for soft-core molecules

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  • Ree, Francis H.

Abstract

Van der Waals' assumption that the parameter a in his model is independent of density and temperature is reexamined for Lennard-Jones particles, using two different types of soft repulsive core potentials: the positive portion of the Lennard-Jones potential and the portion of the Lennard-Jones potential associated with the repulsive force. The latter core potential is found to give a nearly constant a. An analytic expression for a is given to account for the observed small density variation. It is applicable from about 25% of the triple-point density to the freezing density.

Suggested Citation

  • Ree, Francis H., 1980. "Reexamination of Van Der Waals model for soft-core molecules," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 104(1), pages 197-209.
    • Handle: RePEc:eee:phsmap:v:104:y:1980:i:1:p:197-209
    DOI: 10.1016/0378-4371(80)90081-3
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