Collisional electron detachment and decomposition rates of SF/sup /minus///sub 6/, SF/sup /minus///sub 5/, and F/sup /minus// in SF/sub 6/: Implications for ion transport and electrical discharges
Measured cross sections for prompt collisional detachment and decomposition of SF/sup /minus///sub 6/, SF/sup /minus///sub 5/, and F/sup /minus// in SF/sub 6/ reported in the preceding companion paper are used to calculate detachment coefficients and ion-conversion reaction coefficients as functions of electric field-to-gas density ratio (/ital E///ital N/) for ion drift in SF/sub 6/. Analysis from a model presented here using these coefficients suggests that prompt electron detachment from SF/sup /minus///sub 6/ and SF/sup /minus///sub 5/ in SF/sub 6/ are insignificant processes in such ion-drift experiments. Calculated rates for ion-conversion processes indicate the necessity to: (1) reexamine the previously measured rates in SF/sub 6/ from drift-tube experiments, and (2) use ion kinetic-energy distributions with larger high-energy tails than the standard distributions assumed in earlier calculations. The calculated detachment and reaction coefficients are used in a model which invokes detachment from long-lived energetically unstable states of collisionally excited SF/sup /minus///sub 6/ to explain the pressure dependence of previously measured detachment coefficients and the high detachment thresholds implied by analysis of electrical-breakdown probability data for SF/sub 6/. Consistent with the interpretation of results from earlier work, the model indicates that at high pressure, measured detachment coefficients depend primarily upon rates for ion conversion and prompt collisional detachment from F/sup /minus//.
- Research Organization:
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899(US); Department of Physics, College of William and Mary, Williamsburg, Virginia 23185
- OSTI ID:
- 5972036
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 91:4; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ANIONS
ATOM COLLISIONS
ATOMIC IONS
BREAKDOWN
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
ELECTRIC DISCHARGES
ELECTRON DETACHMENT
ELEMENTS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
FLUORINE IONS
GASES
HALIDES
HALOGEN COMPOUNDS
ION COLLISIONS
ION MOBILITY
ION-ATOM COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KINETICS
MOBILITY
MOLECULAR IONS
MOLECULE COLLISIONS
NONMETALS
PARTICLE MOBILITY
RARE GASES
REACTION KINETICS
SULFUR COMPOUNDS
SULFUR FLUORIDES