Measurements of thermal electron attachment rate coefficients to molecules using an electron swarm technique

  • C. A. MayhewEmail author
  • A. D.J. Critchley
  • D. C. Howse
  • V. Mikhailov
  • M. A. Parkes
Plasmas and High Pressure Measurements


An existing electron swarm apparatus has been redesigned and upgraded. In particular, the new design incorporates a novel planar radioactive foil to form an integral part of the drift tube, allowing us to overcome inherent problems present in our earlier system which used a cylindrical radioactive source. In addition to this, substantial upgrades have been made to improve the gating and amplification electronics and the data acquisition system. This has resulted in a much greater signal to noise ratio and improved accuracy. This paper describes the upgraded apparatus and its use in obtaining thermal (300 K) attachment rate coefficients to a number of molecules. The quality of the measurements and data are illustrated through the measurement of the thermal attachment rate coefficient for SF6 (kth(SF6) = (2.38 ±0.15 ) ×10 -7 cm3 s-1). Thermal electron attachment rate coefficients for four other molecules are presented, namely for two derivatives of SF6, SF5CF3 and SF5Cl, and two perfluorocarbons, c-C4F8 and 2-C4F8.


Neural Network Data Acquisition Complex System Nonlinear Dynamics Acquisition System 
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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • C. A. Mayhew
    • 1
    Email author
  • A. D.J. Critchley
    • 1
  • D. C. Howse
    • 2
  • V. Mikhailov
    • 1
  • M. A. Parkes
    • 1
  1. 1.School of Physics and Astronomy, University of BirminghamEdgbastonUK
  2. 2.Walsall College of Arts and Technology, St. Pauls StreetWalsallUK

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