Diffusion tensor of electron or light ion swarm in electric fields in gases

T. Makabe, T. Mori

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The diffusion tensor in an isolated electron or light ion swarm subject only to elastic collisions with molecules has been formulated from the multiterm expansion of the Boltzmann equation in the hydrodynamic description. Derived diffusion coefficients for the transverse and longitudinal directions include the additional terms representative of the curvature effect under the action of an electric field besides the usual two-term expressions. Discussion is, particularly, focused on the relation between the transverse diffusion coefficient DT and its conventional expression DV. Numerical calculations have been made for the electron swarm in a model gas having a momentum transfer cross-section, Qm( epsilon )=Q0 epsilon beta ( beta =0, 1/2, 1), with isotropic scattering. It will be recognised that an appreciable degree of discrepancy occurs between DT and DV with the increase of the power beta , i.e. of the cross-sectional dependence on energy.

Original languageEnglish
Article number009
Pages (from-to)699-708
Number of pages10
JournalJournal of Physics D: Applied Physics
Issue number4
Publication statusPublished - 1984 Dec 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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