Triangular well model

The triangular well model, proposed by T. Nagayimain one dimension , is given by

${\mathrm{\Phi }}_{12}(r)=\{\begin{array}{ccc}\mathrm{\infty }& ;& r\le \sigma \\ & ;& \sigma <r\le \lambda \sigma \\ 0& ;& r>\lambda \sigma \end{array}$

where ${\mathrm{\Phi }}_{12}(r)$ is the intermolecular pair potential, $r$ is the distance $r:=|{\mathbf{r}}_1-{\mathbf{r}}_2|$, $\sigma$ is the hard diameter, $ϵ$ is the well depth and λ > 1.

Virial coefficients

$B_2$, $B_3$ and $B_4$

References

Related reading

• Damon N. Card and John Walkley "Perturbation Calculations for a Triangular Well Potential at Low Densities", Canadian Journal of Physics 50 pp. 1419–1426 (1972)
• Damon N. Card and John Walkley "Monte Carlo and Perturbation Calculations for a Triangular Well Fluid", Canadian Journal of Physics 52 pp. 80-88 (1974)
• F. F. Betancourt-Cárdenas, L. A. Galicia-Luna, A. L. Benavides, J. A. Ramírez and E. Schöll-Paschinger "Thermodynamics of a long-range triangle-well fluid", Molecular Physics 106 pp. 113-126 (2008)
• Shiqi Zhou "Thermodynamics and phase behavior of a triangle-well model and density-dependent variety", Journal of Chemical Physics 130 014502 (2009)