Bound State Formation and Optical Properties of Partially Ionized Dense Plasmas

Abstract

Key words Dense plasmas, dielectric function, dynamic structure factor, Mott effect, metal-nonmetal transition. PACS 52.25Mq, 52.27Gr, 52.27Lw, 52.38DxLinear response theory is used to describe the response of a charged particle system to external electromagnetic fields. Properties such as the polarization function, the dynamical conductivity and the absorption coefficient are expressed in terms of equilibrium correlation functions. Many-particle theory is used to treat correlations in the Coulomb system. The systematic inclusion of bound states is shown. Modifications due to the influence of a dense medium lead to the dissolution (Mott effect) of bound states, which is adequately described in terms of the single-particle spectral function.

Neutral helium spectral lines in dense plasmas

“…14. We find that the shift of this line is more sensitive to plasma screening, as the virtual transitions to neighboured states do not contribute to the line profile if the energy difference is comparable to the plasma frequency [66,78]. The discrepancy between our results and the available data is more Table I and II given by Bassalo et al [76].…”

Excited-state potentials for modelling dense plasmas from first principles

“…Such inhomogeneities can have profound impacts on electronic transport properties [36][37][38]. By design, the K-S system also hides the complicated electronic correlations needed to describe interaction driven localisation and the transition between bound and free states [39][40][41]. Excited-state, frozen-core pseudopotentials offer a computationally cheap means to avoid these limitations by modelling the interaction of specific ion charge states with the surrounding plasma.…”