Electron-Impact Ionization: Fragmentation and Cross-Section

A special issue of Atoms (ISSN 2218-2004).

Deadline for manuscript submissions: closed (15 June 2025) | Viewed by 750

Special Issue Editor


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Guest Editor
Korea Institute of Fusion Energy, Gunsan 54004, Republic of Korea
Interests: electron impact scattering; positron impact scattering; thermochemistry; cross-section; quantum chemistry

Special Issue Information

Dear Colleagues,

Electron impact ionization is a governing process in many scientific and industrial applications. As the fundamental process dominating the electron-impact interaction for a wide energy range, the investigation of ionization provides useful insights. Further, cross-sections are key inputs for various simulations in scientific fields such as plasma physics, atmospheric science and radiation biology. These simulations need accurate total and partial cross-sections, which require reliable studies on electron-impact ionization patterns. These fragmentation patterns allow us to estimate the branching ratio, which is the key information for partial ionization cross-sections. The scope of this Special Issue encompasses a broad range of topics related to electron-ionization processes, including theoretical and experimental studies of fragmentation mechanisms, cross-section measurements, and computational simulations of electron-impact ionization.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Fragmentation pathways following the ionization of the parent species;
  • Branching ratio or the mass spectra of the positive ionization of the target;
  • Electron-impact ionization cross-sections covering total and partial cross-sections.

Through this Special Issue, we aim to provide information not only on atoms and molecules but also on ions.

I look forward to receiving your contributions.

Dr. Nidhi Sinha
Guest Editor

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Keywords

  • Ionization
  • cross-section
  • fragmentation
  • mass spectra
  • partial ionization cross-section

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Published Papers (1 paper)

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Research

13 pages, 398 KiB  
Article
Electron Impact Ionization and Partial Ionization Cross Sections of Plasma-Relevant SiClx (x = 1–3) Molecules
by Savinder Kaur, Ajay Kumar Arora, Kasturi Lal Baluja and Anand Bharadvaja
Atoms 2025, 13(7), 64; https://doi.org/10.3390/atoms13070064 - 3 Jul 2025
Viewed by 314
Abstract
The electron-impact ionization and partial ionization cross sections are reported for few silicon-chlorine molecules using semi-empirical methods. The partial ionization cross sections are determined using a modified version of the binary-encounter-Bethe model. In this approach, the binary-encounter-Bethe model is modified through a two-step [...] Read more.
The electron-impact ionization and partial ionization cross sections are reported for few silicon-chlorine molecules using semi-empirical methods. The partial ionization cross sections are determined using a modified version of the binary-encounter-Bethe model. In this approach, the binary-encounter-Bethe model is modified through a two-step process, namely, transforming the binding energies of the occupied orbitals and introducing a scaling factor. The scaling can be done using either the mass spectrometry data or experimental values of cross sections. It correctly adjusts the scaling term of the BEB model so that the order of magnitude of resulting partial ionization cross sections is the same as that of experimental values. Further, the use of the experimental value of ionization and appearance energy values ensures that the cross sections have a correct threshold. This further mitigates the dependence of cross sections on energy at low values. The role of the scaling factor and the behavior of branching ratios is also examined at different energies. The species whose partial ionization cross sections are reported are highly relevant in plasma processing. However, the proposed model can be extended to any multi-centerd molecular structures comprising a large number of atoms or electrons, except in cases where resonance effects or additional ionization channels become significant. The mass spectrometry data is of utmost importance in computing partial ionization cross sections in order to obtain reliable results. Full article
(This article belongs to the Special Issue Electron-Impact Ionization: Fragmentation and Cross-Section)
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