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Limiting field strength and electron swarm coefficients of the CF3I–SF6 gas mixture

We have measured the electron drift velocity, longitudinal diffusion, and the effective ionization coefficients in the gaseous mixture of CF3I–SF6 over the density-normalized electric field intensity E/N, from 375 to 500 Td (1 Td = 10−17 V cm2). A pulsed Townsend technique was used. Overall, the gas mixture compositions were varied from 50 to 90% CF3I. We have found that the limiting field strength E/Nlim of the CF3I–SF6 mixture is superior to that of CF3I–N2, and always higher than that of SF6. Moreover, over the whole mixture range, the range of the limiting field strength for the CF3I–SF6 mixture is 360–437 Td, these limits corresponding for pure SF6 and CF3I, respectively.