Construction of effective interpolating equation of state for one-and two-component classical plasma

Abstract

An effective approach for construction of simple approximation for description of non-ideality effects in classical one- and two-component plasma model is under discussion. General constraints i.e. positiveness and exponential type for radial distribution functions F2(r) combined with normalizing (local electroneutrality) conditions, which validity is independent on degree of non-ideality, are used for effective correction of several well-known approximated forms of F(r). Resulting corrected forms F*(r) leads to non-ideality corrections, which are asymptotically exact in the weak non-ideality limit and at the same time have good extrapolating properties in the strong non-ideality limit. The simplest example - corrected Debye-Hueckel approximation - leads to simple and explicit form of such non-ideality corrections. The same approach is applied to classical two-component plasma model. Resulting corrected approximation gives smooth and plausible interpolation between weak and strong non-ideality limits.