Effect of anisotropic scattering for rotational collisions on electron transport parameters in CO. (1st July 2021)

• Record Type: Journal Article
• Authors: Vialetto, L; Ben Moussa, A; van Dijk, J; Longo, S; Diomede, P; Guerra, V; Alves, L L
• Is Part Of: Plasma sources science & technology. Volume 30:Number 7(2021)
• Publication Date: 2021-07-01
• Subjects: carbon monoxide -- anisotropic scattering -- angular distribution -- cross section; Plasma (Ionized gases) -- Periodicals; 530.44
• DOI: 10.1088/1361-6595/ac0a4d
• Languages: English
• ISSNs: 0963-0252

Abstract

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.