Measurement of electron swarm coefficients in C2F4-Xe and evidence of Penning ionization in C2F4-Ar

  • A. Bekstein
  • J. de Urquijo
  • J. L. Hernández-Ávila
  • E. Basurto
Regular Article
Part of the following topical collections:
  1. Topical issue: Electron/Positron Collision

Abstract

We have measured the electron drift velocity, the effective ionization coefficient, and the longitudinal diffusion coefficient of electrons in the C2F4-Xe mixtures with 1% and 5% amount of C2F4. The electron drift velocity curves show a well defined region of negative differential drift velocity, and a similar effect is found for the density-normalized longitudinal diffusion coefficients at low E/N values. Previous findings of possible Penning ionization effects on the pulse shapes in the C2F4-Ar mixtures were not found in C2F4-Xe. This effect is further explored in this paper and fully supported by the simulation of avalanche development in the C2F4-Ar mixtures in which, apart from electron transport and effective ionization, the formation of metastable Ar followed by ionization of C2F4 has been included. In most cases the comparison between simulations and measurements is very good, thereby giving further support to the original hypothesis.

Keywords

Topical issue: Electron/Positron Collision. Guest editors: Michael Brunger, Anne Lafosse, Gaetana Laricchia, Paulo Limao-Vieira and Nigel Mason 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • A. Bekstein
    • 1
  • J. de Urquijo
    • 1
  • J. L. Hernández-Ávila
    • 2
  • E. Basurto
    • 2
  1. 1.Instituto de Ciencias FísicasUniversidad Nacional Autónoma de MéxicoCuernavaca, Mor.México
  2. 2.Departamentos de Energía y de Ciencias BásicasUniversidad Autónoma Metropolitana-AzcapotzalcoMéxico, D.F.México

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