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Cross Sections for Ionization of Mo and Mo+ by Electron Impact

Published

Author(s)

D H. Kwon, Y J. Rhee, Yong Sik Kim

Abstract

Theoretical cross sections for electron-impact ionization of the neutral Mo Atom and Mo+ ion are reported. Both Mo and Mo+ have many metastable levels near the ground level. We calculated ionization cross sections from the ground and two lowest metastable levels for both Mo and Mo+. The total ionization cross sections for each initial state consist of direct and indirect ionization cross sections. The direct ionization cross sections were calculated by using the binary-encounter Bethe (BEB) model. The indirect ionization cross sections resulting from numerous excitation-autoionization were calculated by using scaled Born cross sections for the excitation of 4d electrons to 4f or 5p, and 4p electrons to 4d or 5s, whose excitation energies exceeded the lowest ionization energy (IE) of the initial states of Mo and Mo+. For Mo, indiect processes contribute as much as 30% to the total ionization cross section, while the Mo+ indirect processes contribute less than 15%. There are no experimental data to compare for Mo. The distorted-wave Born cross sections for Mo available in the literature fall lower than the present work as the incident electron energy increases, an indication that the distorted-wave calculation may need more partial waves. There are two sets of experimental data for Mo+ to compared to the present work. Our total section for the single ionization of Mo+ is in good agreement with the experiments, while the distorted-wave Born cross section available in the literature is almost a factor of two higher than experiments at the cross section peak.
Citation
Physical Review A (Atomic, Molecular and Optical Physics)

Keywords

electron impact ionization, molybdenum, molybdenum ion

Citation

Kwon, D. , Rhee, Y. and Kim, Y. (2021), Cross Sections for Ionization of Mo and Mo+ by Electron Impact, Physical Review A (Atomic, Molecular and Optical Physics) (Accessed April 15, 2024)
Created October 12, 2021