I Sauers and G Harman 1992 J. Phys. D: Appl. Phys. 25 774 doi:10.1088/0022-3727/25/5/006
I Sauers and G Harman
Show affiliationsFor pt.I see ibid., vol.25, p.761 (1992). The effects of water and SF6 by-products on both positive and negative ion formation in an SF6 corona have been examined. For a positive corona for 'pure' SF6 at p=6.5 kPa the primary ions observed are SF5+, SF3+ and SF2+, with water addition (in the range 0-640 p.p.m.) ion conversion and clustering occurs leading to H+(H2O)n, (n=1-4), SF5+(H2O)n, (n=0-2), SOF3+(H2O)n, (n=0-2). For a negative corona for 'pure' SF6, the primary ions observed are SF6-, SF5- and F-, with water addition ion conversion and clustering also occurs leading to F-(HF)n, (n=0-4), OH-(H2O)n, (n=0-2), SOF5-(HF)n (n=0, 1), SF6-(HF)n, (n=0, 1), SO2F- and SO2F2-, where HF is a neutral by-product of the SF6/H2O corona. Of these ions OH-(H2O)n is considered a possible 'seed' ion for collisional electron detachment in an SF6/H2O corona. It is shown that by-product formation such as the production of SOF4, even when present at trace levels, will lead to significant modifications to the negative ion content.
52.27.Cm Multicomponent and negative-ion plasmas
52.25.Tx Emission, absorption, and scattering of particles
51.50.+v Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
Issue 5 (14 May 1992)
I Sauers and G Harman 1992 J. Phys. D: Appl. Phys. 25 774
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