Drift Tube Study of One-Electron Capture Reactions between Double-Charged Ions and Rare Gas Atoms

  • Koizumi Tetsuo
    Department of Physics, Faculty of Science, Rikkyo University
  • Okuno Kazuhiko
    Department of Physics, Faculty of Science, Tokyo Metropolitan University
  • Kaneko Yozaburo
    Department of Physics, Faculty of Science, Tokyo Metropolitan University

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  • Drift Tube Study of One Electron Captur

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An injected-ion drift tube mass spectrometer was used to study the one-electron capture reactions in the systems Kr+++Ne and Xe+++Ar. The drift tube was cooled with liquid nitrogen so as to widen the energy range from 10 meV to several eV. The cross sections for the ground state of primary ions were separated from those for the low-lying metastable states by applying both the attenuation method and the threshold measurement. It was found that a large difference exists in the absolute magnitudes or cross section according to the electronic states of primary ions. The reaction Xe++(3P)+Ar has a very large cross section of 10−14 cm2 at 0.02 eV, while the reaction Xe++(excited)+Ar is immeasurable. This difference is explained with a curve crossing model.

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