Electron-Impact Ionization and Ionic Fragmentation of O₂ from Threshold to 120 eV Energy Range

Abstract

We study the electron-impact induced ionization of O2 from threshold to 120 eV using the electron spectroscopy method. Our approach is simple in concept and embodies the ion source with a collision chamber and a mass spectrometer with a quadruple filter as a selector for the product ions. The combination of these two devices makes it possible to unequivocally collect all energetic fragment ions formed in ionization and dissociative processes and to detect them with known efficiency. The ion source allows varying and tuning the electron-impact ionization energy and the target-gas pressure. We demonstrate that for obtaining reliable results of cross-sections for inelastic processes and determining mechanisms for the formation of O+(4S, 2D, 2P) ions, it is crucial to control the electron-impact energy for production of ion and the pressure in the ion source. A comparison of our results with other experimental and theoretical data shows good agreement and proves the validity of our approach.

Department(s)

Physics

Keywords and Phrases

cross-section; Fragmentation; Ionization; mass spectroscopy; metastable O+ions

International Standard Serial Number (ISSN)

0217-9792

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2021 World Scientific Publishing, All rights reserved.

Publication Date

20 Mar 2021

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