Electron swarm coefficients in CO_2-Air mixtures

摘要

The electron swarm coefficients (drift velocity, longitudinal diffusion coefficient and effective ionization coefficient) have been measured up to about 400 Td using a time-resolved pulsed Townsend technique in CO_2, dry Air and CO2-Air mixtures. Simultaneously, these electron swarm coefficients, including the transverse diffusion coefficient, have been calculated from an adequate multi-term solution of the Boltzmann equation, using previously validated sets of electron-molecule-collision cross sections. We have found good agreement between measurements and calculations, both for pure gases and mixtures, and especially for the case of the calculated mean electron drift velocity. Thus, the calculations have been extended over a larger E/N range than that covered by the measurements (i.e. up to 1000 Td), so that these can be used for the modeling of electrical discharge dynamics and kinetics, which in turn can help us gain better understanding of the electrical discharges used in environmental applications, for instance.