On the Long-Lived Excited State of Ar II

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  • Matsuo Takashi
    Department of Physics, Faculty of Science, Tokyo Metropolitan University
  • Kobayashi Nobuo
    Department of Physics, Faculty of Science, Tokyo Metropolitan University
  • Kaneko Yozaburo
    Department of Physics, Faculty of Science, Tokyo Metropolitan University

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Time-of-flight energy spectra of Ar atoms produced through charge transfer reactions in collisions of Ar+(metastable ArM+) ions with Ne atoms have been measured at a collison energy of 50 eV. Two prominent peaks appear at exoergicities of about 0.35 and 1 .5 eV. The measurement of the appearance energies of these peaks suggests that the 0.35 eV peak is due to metastable 3d′2F7⁄2 ions and that the 1.5 eV peak is an indication of the existence of an unknown long-lived excited Ar+ state.

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