Effect of anisotropic scattering for rotational collisions on electron transport parameters in CO

L. Vialetto*, A. Ben Moussa, J. van Dijk, S. Longo, P. Diomede, V. Guerra, L.L. Alves

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The role of anisotropic scattering in rotational collisions of electrons with CO molecules is investigated numerically with Monte Carlo (MC) simulations and with calculations using the Lisbon KInetics two-term Boltzmann solver (LoKI-B). The study adopts integral cross sections taken from the IST-Lisbon database of LXCat or extracted from Biagi's code Magboltz v11.10. Different angular scattering models for rotational collisions are implemented and compared in MC simulations, and a novel anisotropic scattering model is derived from the dipole-Born differential cross sections, to describe the strongly forward-peaked nature of rotational collisions. This model is also implemented in LoKI-B, to describe the anisotropic inelastic/superelastic scattering in dipole rotational collisions, using coherent expressions for the corresponding integral and momentum transfer cross sections. The comparison between MC and LoKI-B results shows that the calculation of swarm parameters is more influenced by the choice of the angular scattering model than the adoption of the two-term approximation, yielding deviations up to 50% in the reduced mobility for different angular distributions. The consequences in the swarm derivation of cross sections are also discussed. Finally, it is shown that inclusion of electric-quadrupole interactions, usually neglected in electron swarm studies, can improve the agreement between numerical results and measurements.
Original languageEnglish
Article number075001
Number of pages20
JournalPlasma Sources Science & Technology
Volume30
Issue number7
DOIs
Publication statusPublished - 1 Jul 2021

Keywords

  • carbon monoxide
  • anisotropic scattering
  • angular distribution
  • cross section
  • CROSS-SECTIONS
  • CARBON-MONOXIDE
  • IMPACT EXCITATION
  • MOMENTUM-TRANSFER
  • POLAR-MOLECULES
  • SLOW-ELECTRONS
  • SIMULATION
  • COEFFICIENTS
  • MOTION
  • SWARMS

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