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

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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.

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Authors and Affiliations

  1. Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251, Cuernavaca, Mor., México

    A. Bekstein & J. de Urquijo

  2. Departamentos de Energía y de Ciencias Básicas, Universidad Autónoma Metropolitana-Azcapotzalco, Av. San Pablo 210, 02200, México, D.F., México

    J. L. Hernández-Ávila & E. Basurto

Authors
  1. A. Bekstein
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  2. J. de Urquijo
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  3. J. L. Hernández-Ávila
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  4. E. Basurto
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Correspondence to J. de Urquijo.

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Bekstein, A., de Urquijo, J., Hernández-Ávila, J.L. et al. Measurement of electron swarm coefficients in C2F4-Xe and evidence of Penning ionization in C2F4-Ar. Eur. Phys. J. D 66, 77 (2012). https://doi.org/10.1140/epjd/e2012-20676-5

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  • DOI: https://doi.org/10.1140/epjd/e2012-20676-5

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