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  • Access by Xinjiang University

Extension of the Law of Corresponding States to Rare-Gas Solids

Gerald L. Pollack

  • Department of Physics, Michigan State University, East Lansing, Michigan 48823

Phys. Rev. A 2, 38 – Published 1 July, 1970

DOI: https://doi.org/10.1103/PhysRevA.2.38

Abstract

It is shown that the law of corresponding states can be applied to sublimation pressure curves of rare-gas solids. The vapor pressure (P) and temperature (T) below the triple point are written in terms of the usual reduced variables P*=Pσ3ε and T*=kTε, where ε and σ are Lennard-Jones potential parameters. It is then demonstrated that a single curve fits the P*, T* data for Ar, Kr, and Xe over the 5-decade range in P* for which measurements have been made, 2×108P*2×103 and 0.36T*0.72. The equation of the curve for Ar, Kr, and Xe is lnP*=5.3028.206T*. The sublimation pressure curve for Ne is different from that of the heavier rare gases because of zero-point energy effects. The equation of the Ne curve is lnP*=4.2877.077T*, over about 3 decades in P*. The historical background of the law of corresponding states and its derivation by De Boer et al. from quantum-mechanical first principles are presented in a way natural to this problem. It is shown that extension of the law of corresponding states to the solid-vapor phase transition is natural and proper. As a corollary, the sublimation pressure for radon is predicted as log10P(Torr)=7.8681034T.

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