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Collisional Decomposition of SF6



R. Champion, I. V. Dyakov, Yicheng Wang


Insulating gas mixtures containing SF6 have been promoted to serve as replacements for pure SF6 in order to reduce SF6 atmospheric emission. It has been argued that some synergism may be achieved by choosing proper buffer gases in mixtures with SF6 such that the buffer gases efficiently slow down electrons into an energy range where the electron attachment cross section for SF6 is large. A complete understanding of the dielectric properties of SF6 mixtures obviously requires information about electron detachment from SF6- as collisional electron detachment may be the principal source of discharge initiation in SF6 mixtures. In this paper, we report total cross section measurements for electron detachment and collision induced dissociation for collisions of SF6- with N2 and other proposed admixture gases for collision energies ranging up to a few hundred eV. The experimental results are analyzed using a two-step collision model where the unimolecular decomposition of collisionally excited SF6- ions is described in a statistical framework.
Proceedings Title
Proc. XIII International Conference on Gas Discharges and Their Applications
Conference Dates
September 3-8, 2000
Conference Location
Glasgow, 1, UK


anion, collision, decomposition, electron detachment, SF<sub>6</sub>, sulfur hexafluoride


Champion, R. , Dyakov, I. and Wang, Y. (2000), Collisional Decomposition of SF<sub>6</sub>, Proc. XIII International Conference on Gas Discharges and Their Applications, Glasgow, 1, UK, [online], (Accessed June 22, 2024)


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Created August 31, 2000, Updated October 12, 2021