# Electron mean energy, secondary ionisation coefficients and $(E/p)_{crit}$ in binary mixtures of $SF_6-N_2$and $CCl_2F_2-N_2$

Siddagangappa, MC and Lakshminarasimha, CS and Naidu, MS (1983) Electron mean energy, secondary ionisation coefficients and $(E/p)_{crit}$ in binary mixtures of $SF_6-N_2$and $CCl_2F_2-N_2$. In: Journal of Physics D: Applied Physics, 16 (9). pp. 1595-1601.

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## Abstract

Measurements of the ratio of diffusion coefficient to mobility (D/ \mu ) of electrons in $SF_6-N_2$and $CCl_2F_-N_2$ mixtures over the range 80<E/p<200 (where E is the electric field in V $cm^-1$ and p is the pressure in Torr reduced to $20^oC$) are reported. Values of $(E/p)_{c. mix}$ (the critical E/p of the mixture, where \alpha = \eta ), and the electron mean energies $(\epsilon)_{c.mix}$ corresponding to $(E/p)_{c. mix}$, are found to vary with the percentage of the electronegative gas in the mixture (F) according to the following relationship: $(E/p)_{c. mix}$ =$(E/p)_{c.N_2}$+$[(E/p)_{c.A}-(E/p)_{c.N_2}]$ $[1-exp(-\beta F/100-F))$ and $\epsilon _{c.mix}$=$\epsilon_ {c.N_2}$ + $(\epsilon _{c.A}-\epsilon_{ c.N_2})$ $[1-exp(-\beta F/100-F)]$ where A refers to the attaching gas, either $SF_6$ or $CCl_2F_2$ and \beta is a constant, equal to 2.43 for $SF_6$ mixtures and 5.12 for $CCl_2F_2$mixtures. In the present study, it has been possible to show that \beta is indeed to a factor of synergism. Estimated \gamma values (secondary ionisation coefficients) did not show any significant variation with F for F<50.

Item Type: Journal Article Copyright of this article belongs to Institute of Physics. Division of Electrical Sciences > High Voltage Engineering (merged with EE) 14 Jul 2008 19 Sep 2010 04:47 http://eprints.iisc.ernet.in/id/eprint/15009