Electron swarm parameters in rare gases and mixtures

Abstract

Calculations of the steady-state electron swarm parameters in rare gases and mixtures are reported. The Townsend ionization coefficient α, electron drift velocity W, and diffusion coefficient D for He, Ne, Ar, and (10% Ar+90% Ne) are calculated as a function of E/N over an extended range (up to 5650 Td) by solving the Boltzmann equation. Total excitation cross sections qx for He, Ne, and Ar have been determined by fitting calculated values of α to experimental literature values over E/N=28–280 Td. Our treatment of the Boltzmann equation takes into account effects of electron density gradient, generation of new electrons and electron-electron interaction. Calculated values of α and W are in good agreement with available experimental data up to highest values of E/N. Comparison of the other parameters has not been made due to insufficient experimental data, especially for high E/N.