Abstract
An experimental technique is described, and the relative cross sections of the single and dissociative electron-impact ionizations of the freon-12 molecule (CCl2F2) in the near-threshold energy range are obtained. The experiment is performed on a device that provides the mass separation and recording of ions with a monopole mass spectrometer. The mass spectrum of the freon-12 molecule is measured at various ionizing-electron energies, and the relative cross sections of dissociative ionization are measured for the most intense ion fragments, including isotope-containing fragments. The threshold dependences of these cross sections are used to determine the appearance potentials of the ion fragments. The isotope shift in the thresh-old appearance energies of ion fragments [C35ClF2]+ and [C37ClF2]+ is measured for the first time.
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Original Russian Text © A.N. Zavilopulo, A.S. Agafonova, A.V. Snegurskii, 2010, published in Zhurnal Tekhnicheskoĭ Fiziki, 2010, Vol. 80, No. 12, pp. 27–32.
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Zavilopulo, A.N., Agafonova, A.S. & Snegurskii, A.V. Electron impact-induced ionization and dissociation of the freon-12 molecule. Tech. Phys. 55, 1735–1740 (2010). https://doi.org/10.1134/S1063784210120042
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DOI: https://doi.org/10.1134/S1063784210120042