Abstract
A technique for mass-spectrometric investigation of the yield of positive ions produced by direct and electron-impact dissociative ionization of methane molecules is described, and respective experimental data are presented. Doubly charged C +2 , CH 2+3 , and CH 2+4 ions, as well as singly charged D +2 , CD +3 , and CD +4 ions, are detected in the mass spectrum of a methane molecule at electron energy U e = 90 eV for the first time. From ionization efficiency curves, the ionization energy of the parent molecule and the appearance energy of fragment ions are determined. The ionization energy of the CH4 molecule is found to be 12.62 ± 0.20 eV. Electron-molecular reactions that may take place when a low-energy electron beam interacts with a methane molecule are analyzed. The ionization process and the formation of methane molecule fragments are studied.
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Original Russian Text © A.N. Zavilopulo, M.I. Mykyta, A.N. Mylymko, O.B. Shpenik, 2013, published in Zhurnal Tekhnicheskoi Fiziki, 2013, Vol. 83, No. 9, pp. 8–14.
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Zavilopulo, A.N., Mykyta, M.I., Mylymko, A.N. et al. Ionization and dissociative ionization of methane molecules. Tech. Phys. 58, 1251–1257 (2013). https://doi.org/10.1134/S1063784213090272
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DOI: https://doi.org/10.1134/S1063784213090272