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 language | English |
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Article number | 075001 |
Number of pages | 20 |
Journal | Plasma Sources Science & Technology |
Volume | 30 |
Issue number | 7 |
DOIs | |
Publication status | Published - 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