Absolute cross sections for electron impact ionization and dissociation of methane from 350 to 8000 eV

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2024-12-04 DOI:10.1016/j.radphyschem.2024.112450

Weizhe Huang, Yuting Zhang, Taj Wali Khan, Nuo Chen, Chunkai Xu, Enliang Wang, Xu Shan, Xiangjun Chen

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引用次数: 0

Abstract

Absolute cross sections for electron impact ionization and dissociation of the planetary atmospherically important molecule, methane, have been measured in a wide energy range from 350 to 8000 eV using an ion momentum imaging spectrometer. The partial ionization cross sections (PICSs) of ionic fragments CH4+, CH3+, CH2+, CH+, C+, H+ and H2+, as well as five dissociation channels are obtained. The total ionization cross sections are also deduced by summing up the PICSs for all the observed ions. The PICSs of the ionic fragments at electron impact energies above 2000 eV and the PICSs of the dissociation processes are reported for the first time. The comparison and evaluation of the previous measurements reveals that the data of Lindsay and Mangan (2003) are in global agreement with present results, recommending reliable cross sections for electron impact ionization of methane from threshold to 8000 eV.

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.