Electron swarm parameters in C2H2, C2H4 and C2H6: Measurements and kinetic calculations

N. R. Pinhão, D. Loffhagen, M. Vass, P. Hartmann, I. Korolov, S. Dujko, D. Bošnjaković, Z. Donkó

Research output: Contribution to journalArticle

Abstract

This work presents swarm parameters of electrons (the bulk drift velocity, the bulk longitudinal component of the diffusion tensor, and the effective ionization frequency) in C2Hn, with n = 2, 4, and 6, measured in a scanning drift tube apparatus under time-of-flight conditions over a wide range of the reduced electric field, 1 Td ≤ E/N ≤ 1790 Td (1 Td = 10-21 V m2). The effective steady-state Townsend ionization coefficient is also derived from the experimental data. A kinetic simulation of the experimental drift cell allows estimating the uncertainties introduced in the data acquisition procedure and provides a correction factor to each of the measured swarm parameters. These parameters are compared to results of previous experimental studies, as well as to results of various kinetic swarm calculations: solutions of the electron Boltzmann equation under different approximations (multiterm and density gradient expansions) and Monte Carlo simulations. The experimental data are consistent with most of the swarm parameters obtained in earlier studies. In the case of C2H2, the swarm calculations show that the thermally excited vibrational population should not be neglected, in particular, in the fitting of cross sections to swarm results.

Original languageEnglish
Article number045009
JournalPlasma Sources Science and Technology
Volume29
Issue number4
DOIs
Publication statusPublished - Jan 1 2020

Keywords

  • Electron swarm parameters
  • drift tube measurements
  • kinetic theory and computations

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Pinhão, N. R., Loffhagen, D., Vass, M., Hartmann, P., Korolov, I., Dujko, S., Bošnjaković, D., & Donkó, Z. (2020). Electron swarm parameters in C2H2, C2H4 and C2H6: Measurements and kinetic calculations. Plasma Sources Science and Technology, 29(4), [045009]. https://doi.org/10.1088/1361-6595/ab7841