Measurements of electron transport coefficients in the 0.468 and 4.910 c-C4F8/Ar mixtures and pure c-C4F8

The electron drift velocity ( W ) and the product of the gas number density and the electron longitudinal diffusion coefficient ( N D L ) were measured in the ranges of E / N over 1.4–100 Td in the 0.468% c-C 4 F 8 /Ar mixture, 8–100 Td in the 4.910% c-C 4 F 8 /Ar mixture, and 170–1000 Td in pure c-C 4 F 8 , by using a double-shutter electron drift apparatus with variable drift length (1–10 cm). The measured electron transport coefficients in these mixtures indicated that the inelastic processes between electrons and the c-C 4 F 8 molecules had a strong influence and the measured electron drift velocity in pure c-C 4 F 8 showed substantial deviation from the reported results in the high E / N range. There are no measurements on ND L in pure c-C 4 F 8 .