Transfer of F/sup -/ in the reaction of SF/sup -/ with SOF/sub 4/: implications for SOF/sub 4/ production in corona discharges

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · Plasma Chem. Plasma Process.; (United States)

DOI:https://doi.org/10.1007/BF01016159· OSTI ID:6180181

Van Brunt, R J; Sieck, L W; Sauers, I; Siddagangappa, M C

The temperature (T) and electric field-to-gas pressure (E/P) dependences of the rate coefficient k for the reaction SF/sub 6//sup -/ + SOF/sub 4/ ..-->.. SOF/sub 5//sup -/ + SF/sub 5/ have been measured. For T < 270 K, k approaches a constant of 2.1 x 10/sup -9/ cm/sup 3//s, and for 433 > T > 270 K, k decreases with T according to k (cm/sup 3//s) = 0.124 exp (-3.3 ln T(K)). For E/P < V/cm x torr, k has a constant value of about 2.5 x 10/sup -19/ cm/sup 3//s, and for 130V/cm x torr > E/P > 60 V/cm x torr, the rate is approximately given by k (cm/sup 3//s) approx. 7.0 x 10/sup -10/ exp (-0.022E/P). The measured rate coefficient is used to estimate the influence of this reaction on SOF/sub 4/ production from negative, point-plane, glow-type corona discharges in gas mixtures containing SF/sub 6/ and at least trace amounts of O/sub 2/ and H/sub 2/O. A chemical kinetics model of the ion-drift region in the discharge gap is used to fit experimental data on SOF/sub 4/ loss mechanism. It is found that the contribution of this reaction to SOF/sub 4/ destruction falls considerably below the estimated maximum effect assuming that SF/sub 6//sup -/ is the predominant charge carrier which reacts only with SOF/sub 4/. The results of this analysis suggest that SF/sub 6//sup -/ is efficiently deactivated by other reactions, and the influence of SF/sub 6//sup -/ + SOF/sub 4/ on SOF/sub 4/ production is not necessarily more significant than that of other slower secondary processes such as gas-phase hydrolysis.

• Research Organization: National Bureau of Standards, Gaithersburg, MD (USA)
• OSTI ID: 6180181
• Journal Information: Plasma Chem. Plasma Process.; (United States), Journal Name: Plasma Chem. Plasma Process.; (United States) Vol. 8:2; ISSN PCPPD
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
&amp; High-Temperature Chemistry
BEAMS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CORONA DISCHARGES
ELECTRIC DISCHARGES
ELECTRON BEAMS
EQUATIONS
FLUORIDES
FLUORINE COMPOUNDS
FLUORINE IONS
HALIDES
HALOGEN COMPOUNDS
ION DENSITY
ION DRIFT
ION EMISSION
ION EXCHANGE
IONIZATION
IONS
KINETIC EQUATIONS
KINETICS
LEPTON BEAMS
MASS SPECTROSCOPY
MATHEMATICAL MODELS
MOLECULAR IONS
OXIDATION
OXYFLUORIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PRESSURE DEPENDENCE
REACTION KINETICS
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR FLUORIDES
TEMPERATURE DEPENDENCE
YIELDS