Argon

The Lennard-Jones model for argon.

Argon has a mass of 39.948 umas. The Lennard-Jones parameters for liquid argon are $\epsilon /k_{B}\approx$ 119.8 K and $\sigma \approx$ 0.3405 nm. (Ref. 1). Barker, Fisher and Watts used the values $\epsilon /k_{B}\approx$ 142.095 K and $\sigma \approx$ 0.33605 nm. (Ref. 2 Table 1). A more recent study suggests the parameters $\epsilon /k_{B}\approx$ 125.7 K and $\sigma \approx$ 0.3345 nm (Ref. 3 parameter set #4)

References

1. L. A. Rowley, D. Nicholson and N. G. Parsonage "Monte Carlo grand canonical ensemble calculation in a gas-liquid transition region for 12-6 Argon", Journal of Computational Physics 17 pp. 401-414 (1975)
2. J. A. Barker, R. A. Fisher and R. O. Watts "Liquid argon: Monte carlo and molecular dynamics calculations", Molecular Physics 21 pp. 657-673 (1971)
3. John A. White "Lennard-Jones as a model for argon and test of extended renormalization group calculations", Journal of Chemical Physics 111 pp. 9352-9356 (1999)