Electron Scattering Cross Section Data of Supercritical CO2 Clusters

Abstract

Density fluctuations caused by clustering occurs during phase transition near the critical point, beyond which is the supercritical phase. Supercritical phase is the intermediate state where fluids show both liquid and gas properties. The high dielectric strength provided by the high density of supercritical fluid exhibits a steep degradation at the phase change due to the so-called clustering effect. In this paper, the dielectric properties of SC CO2 have been studied. Based on the dielectric strength analysis method used for gas mixtures, the electron-scattering cross section data of SCF CO2 clusters is utilized, which are modified from those of gaseous CO2 assuming various cluster sizes, to estimate the density-fluctuation-dependent dielectric strength of SCF CO2. The electron energy loss models of distinct electron energy levels have been utilized to determine the geometrical electron scattering cross section data of SCF CO2 clusters with various cluster sizes and impinging electron energies.