Identification of corona discharge-induced SF/sub 6/ oxidation mechanisms using SF/sub 6///sup 18/O/sub 2//H/sub 2/ /sup 16/O and SF/sub 6///sup 16/O/sub 2//H/sub 2/ /sup 18/O gas mixtures
The absolute yields of gaseous oxyfluorides SOF/sub 2/, SO/sub 2/F/sub 2/, and SOF/sub 4/ from negative, point-plane corona discharges in pressurized gas mixtures of SF/sub 6/ with O/sub 2/ and H/sub 2/O enriched with /sup 18/O/sub 2/ and H/sub 2/ /sup 18/O have been measured using a gas chromatograph-mass spectrometer. The predominant SF/sub 6/ oxidation mechanisms have been revealed from a determination of the relative /sup 18/O and /sup 16/O isotope content of the observed oxy-fluoride by-products. The results are consistent with previously proposed production mechanisms and indicate that SOF/sub 2/ and SO/sub 2/F/sub 2/ derive oxygen predominantly from H/sub 2/O and O/sub 2/, respectively, in slow, gas-phase reactions involving SF/sub 4/, SF/sub 3/, and SF/sub 2/ that occur outside of the discharge region. The species SOF/sub 4/ derives oxygen from both H/sub 2/O and O/sub 2/ through fast reactions in the active discharge region involving free radicals or ions such as OH and O, with SF/sub 5/ and SF/sub 4/.
- Research Organization:
- National bureau of Standards, Gaithersburg, MD (USA)
- OSTI ID:
- 6288725
- 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
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& High-Temperature Chemistry
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHROMATOGRAPHY
CORONA DISCHARGES
ELECTRIC DISCHARGES
ELEMENTS
EVEN-EVEN NUCLEI
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GAS CHROMATOGRAPHY
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IONIZATION
IONS
ISOTOPE APPLICATIONS
ISOTOPE RATIO
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LIGHT NUCLEI
MASS SPECTROSCOPY
MOLECULAR IONS
NONMETALS
NUCLEI
OXIDATION
OXYFLUORIDES
OXYGEN
OXYGEN 16
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN IONS
OXYGEN ISOTOPES
QUANTITATIVE CHEMICAL ANALYSIS
RADIOCHEMICAL ANALYSIS
REACTION KINETICS
SEPARATION PROCESSES
SPECTROSCOPY
STABLE ISOTOPES
SULFUR COMPOUNDS
SULFUR FLUORIDES
TRACER TECHNIQUES
VAPORS
WATER VAPOR
YIELDS