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Influence of water vapor and decomposition products on the positive- and negative-ion spectra of SF/sub 6/ corona [electronic resource].

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1989.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 4 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We report on the positive- and negative-ion spectra obtained from in-situ mass spectrometric analyses of ions sampled from corona discharges in SF/sub 6/ at P = 6.7 kPa (50 Torr). In positive-ion spectra the presence of water vapor results in the formation of water cluster ions of the form H/sup +/(H/sub 2/O)/sub n/. The distribution of cluster sizes shifts to smaller clusters as the water vapor content decreases. In addition to the SF/sub 6/ fragment ions (SF/sub 5//sup +/, SF/sub 3//sup +/, and SF/sub 2//sup +/), which are observed under relatively dry conditions, the hydrated species SF/sub 5//sup +/(H/sub 2/O) is observed down to water additions of only 40 ppM, the lowest concentration studied. In addition, the ion detected at mass 197 is believed to be the complex SF/sub 3//sup +/(SF/sub 4/) where SF/sub 4/ is an important neutral by-product of SF/sub 6/ discharges. In negative-ion spectra, the influence of water vapor is manifested indirectly by the formation of HF clusters of the form F/sup /minus//(HF)/sub n/. Other clustered species observed include OH/sup /minus//(H/sub 2/O)/sub n/ and OH/sup /minus//(HF)/sub n/. The role of other decomposition by-products, such as SOF/sub 4/ and SO/sub 2/, of SF/sub 6/ corona on the positive- and negative-ion spectra will also be discussed. 11 refs., 6 figs., 1 tab.
Report Numbers
E 1.99:conf-890829-2
conf-890829-2
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Note
Published through SciTech Connect.
01/01/1989.
"conf-890829-2"
"DE89016879"
6. international symposium on high voltage engineering (ISHVE-6), New Orleans, LA, USA, 28 Aug - 1 Sep 1989.
Sauers, I.; Siddagangappa, M.C.; Harman, G.
Funding Information
AC05-84OR21400
View MARC record | catkey: 13806944