Thermal energy electron attachment rate constants for some polyatomic molecules
- 1 September 1973
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 59 (5), 2324-2329
- https://doi.org/10.1063/1.1680339
Abstract
Rate constants for the attachment of thermal energy electrons to a number of polyatomic molecules are reported. The attachment rate constants αw are determined in an electron swarm experiment under zero electric field conditions where the electrons have a Maxwellian energy distribution corresponding to the temperature of the nonattaching diluent gas. Various diluent gases were used, and no significant differences in the attachment rate constants were found. Corrections to the attachment rate constant measurements due to electron diffusion are small and are taken into account. Thermal energy attachment rate constants are reported for the following molecules (attachment rate constants are given in parentheses in units of cubic centimeters per second): SeF6(1.27 × 10−9), CCl4 (3.55 × 10−7) C7F14(4.0 × 10−8), C6F6(1.06 × 10−7), C7F8(2.42 × 10−7), C6F10(3.13 × 10−7), C5F8 (1.18 × 10−7), C4F8(1.11 × 10−8), C8H8(7.7 × 10−10), and SO2F2(5.8 × 10−10). Upper limits to the attachment rates for the following molecules were obtained using pure gases: CF4, C2F6, C3F8, CClF3, CHF3, CHClF2, C2H2F2, C2H4F2, C2ClF5, and TeF6. An upper limit of ∼3 × 10−12 cm3/sec for the thermal electron attachment rate constant for HC1 in a mixture with N2 as a carrier gas is reported and is more than 100 times smaller than a previously reported value.Keywords
This publication has 18 references indexed in Scilit:
- Application of electron cyclotron resonance technique in studies of electron capture processes in the thermal energy rangeThe Journal of Physical Chemistry, 1972
- Thermal and Near-Thermal Electron Transport Coefficients in O2 Determined with a Time-of-Flight Swarm Experiment Using a Drift-Dwell-Drift TechniqueThe Journal of Chemical Physics, 1972
- Electron Attachment to SF6The Journal of Chemical Physics, 1970
- Determination of Electron Thermalization Times in Irradiated GasesThe Journal of Chemical Physics, 1970
- Transient Negative-Ion States in Alicyclic and Aromatic Fluorocarbon MoleculesThe Journal of Chemical Physics, 1968
- Experimental Determination of Rate Constants for Thermal Electron Attachment to Gaseous SF6 and C7F14The Journal of Chemical Physics, 1968
- Electron Attachment to Halogenated Aliphatic HydrocarbonsThe Journal of Chemical Physics, 1968
- Townsend energy coefficients for electron swarms in polyatomic gasesTransactions of the Faraday Society, 1967
- Correlation of Sodium Atom Reaction Rates with Electron Capture Cross-sectionsNature, 1965
- Measurement of the Attachment of Slow Electrons in OxygenPhysical Review Letters, 1959