Low energy electron attachment to SF/sub 6/ in N/sub 2/, Ar, and Xe buffer gases
The electron attachment rate constants k/sub a/ for SF/sub 6/ have been measured in dilute mixtures of SF/sub 6/ in high pressure (>1 atm) N/sub 2/, Ar, and Xe buffer gases at room temperature (Tapprox. =300 K) over a wide E/N range (electric field strength to gas number density ratio), corresponding to mean electron energies from near thermal electron energies (approx. =0.04 eV) to approx. =4.3 eV. Particular attention has been paid to the effects of space charge distortion, molecular impurities, and changes in the electron energy distribution function on the measured electron attachment rate constant values at the lower E/N values in these mixtures. The present measured thermal electron attachment rate constants in SF/sub 6//N/sub 2/ and SF/sub 6//Xe gas mixtures are in excellent agreement with recent accurate measurements of these parameters in several SF/sub 6//buffer gas mixtures. At higher values, the present SF/sub 6//N/sub 2/ measurements are in fair agreement with previous measurements, while no previous measurements using Ar and Xe buffer gases have been published. These measurements have been used in numerical two term, spherical harmonic Boltzmann equation analyses of the electron motion in these gas mixtures to obtain the low energy (<10 eV) nondissociative and dissociative electron attachment cross sections for SF/sub 6/. The present derived electron attachment cross sections are compared with recently measured and derived nondissociative and dissociative electron attachment cross sections for SF/sub 6/.
- Research Organization:
- Atomic, Molecular, and High Voltage Physics Group, Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
- OSTI ID:
- 6190687
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 90:9; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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400201 -- Chemical & Physicochemical Properties
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
COLLISIONS
CROSS SECTIONS
ELECTRON ATTACHMENT
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
KINETICS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
RARE GASES
SULFUR COMPOUNDS
SULFUR FLUORIDES
XENON