Electron attachment in binary mixtures of electronegative and buffer gases

Abstract

The ratio of the electron attachment coefficient eta to the gas pressure p (reduced to 0 degrees C) evaluated from the Townsend current growth curves in binary mixtures of electronegative gases (SF6, CCl2F2, CO2) and buffer gases (N2, Ar, air) clearly indicate that the eta /p ratios do not scale as the partial pressure of electronegative gas in the mixture. Extensive calculations carried out using data experimentally obtained have shown that the attachment coefficient of the mixture eta mix can be expressed as eta mix= eta (1-exp- beta F/(100-F)) where eta is the attachment coefficient of the 100% electronegative gas, F is the percentage of the electronegative gas in the mixture and beta is a constant. The results of this analysis explain to a high degree of accuracy the data obtained in various mixtures and are in very good agreement with the data deduced by Itoh and co-workers (1980) using the Boltzmann equation method.

Solving of the Boltzmann transport equation using two - term approximation for pure electronegative gases (SF6, CCl2F2)

“…While, figure (9) compares the present ionization coefficient values with previous results. It is seen that, the present calculation is in agreement with experimental and theoretical values (Settaouti and Settaouti, 2005), (Aschwanden, 1985), (Shimozuma et al, 1982), (Siddagangappa et al, 1982), but the theoretical results of (Itoh et al, 1993) lower than that of present results for all range of E/N values. which (α/N=η/N) is obtained in the present calculation is approximately equal to (361Td), in agreement with the results of: 361Td (Aschwanden, 1985), 362 Td (Tezcan et al, 2010), 362 Td (Itoh et al, 1993), 361Td (Mohammed, 2009), 362 Td (Itoh et al, 1988).…”

Research for electric energy systems - an annual report

“…It is seen from [42] and Siddagangappa, et al [43] yield respectively the highest and lowest degrees of consistency with the assumed swarm and cross section data.…”

“…where the dash-dot curve is a fit to the data of Siddagangappa and co-workers [43] and the solid and dashed curves are fits to the data of Verhaart [42] using respectively numerical and analytical representations of the relevant cross sections (see Table I Best fits to the indicated strength data for the highest degrees of consistency (see Table II). [48] (see Table III).…”

Kinetic behaviors and dielectric strength of SF<inf>6</inf> and N<inf>2</inf> over the E/N range from 160 to 650Td

“…Therefore, in order to analyze the dielectric strength of [12]. 2 N is a neutral gas, its chemical property is stable, the electrons almost never attach with the other particles, its attachment coefficient is about 0 [13], therefore ionization is the most important thing in the electrons transport, the density-reduced ionization coefficient …”