4.6 Article

Electron-neutral collision cross sections for H2O: I. Complete and consistent set

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 55, Issue 44, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6463/ac8da3

Keywords

H2O; electron-neutral collision cross section; electron swarm technique; two-term Boltzmann solver; molecular rotation

Funding

  1. European Union [MSCA ITN 813393]
  2. Portuguese FCT-Fundacao para a Ciencia e a Tecnologia [UIDB/50010/2020, UIDP/50010/2020, PTDC/FIS-PLA/1616/2021, PD/BD/150414/2019, EXPL/FIS-PLA/0076/2021]
  3. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [434434223 - SFB 1461]

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This work introduces a set of cross sections for electron collisions with water molecules, validated and optimized for use in plasma chemistry modeling.
This work proposes a complete and consistent set of cross sections (CSs) for electron collisions with water molecules to be published in the IST-Lisbon database on LXCat. The set is validated from the comparison between experimental and computed electron swarm parameters. The former are collected from literature while the latter are calculated using a space-homogeneous two-term Boltzmann solver, assuming isotropic scattering in inelastic collisions. Rotational CSs, based on the Born approximation, are optimised by means of the electron swarm analysis technique. Superelastic rotational and vibrational collisions are accounted for in the calculations and found to be particularly important for low-energy electrons interacting with water molecules. The set can be used with codes assuming space-homogeneous conditions, in particular common two-term Boltzmann solvers, ensuring a good agreement with experiments. Therefore, it constitutes an important tool for fast calculations and modelling of complex plasma chemistries.

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