The Electronegativity Analysis of c-C₄F₈ as a Potential Insulation Substitute of SF₆

The density distributions related to gas electronegativity for c-C₄F₈ gas, including negative ion, electron number and electron energy densities in the discharge process, are derived theoretically in both plane-to-plane and point-to-plane electrode geometries. These calculations have been performed through the Boltzmann equation in the condition of a steady-state Townsend (SST) experiment and a fluid model in the condition of both uniform and non-uniform electric fields. The electronegativity coefficients a = n−/ne of c-C₄F₈ and SF₆ are compared to further describe the electron affinity of c-C₄F₈. The result shows that c-C₄F₈ represents an obvious electron-attachment performance in the discharge process. However, c-C₄F₈ still has much weaker gas electronegativity than SF₆, whose electronegativity coe?cient is lower than that of SF₆ by at least three orders of magnitude.