Deexcitation cross sections of He(2 1<i>P</i>) by atoms and molecules

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  • Masatoshi Ukai
    Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152, Japan
  • Hidenobu Nakazawa
    Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152, Japan
  • Kyoji Shinsaka
    Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152, Japan
  • Yoshihiko Hatano
    Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152, Japan

抄録

<jats:p>The deexcitation cross sections of He(2 1P) by M (M=Kr, Xe, H2, D2, N2, CO, O2, NO, CO2, and CH4) have been obtained by a pulse radiolysis method at a mean collisional energy corresponding to room temperature. The cross sections have been explained fairly well by the Penning ionization process with a long-range dipole–dipole interaction. Bent trajectories appear to be important in the deexcitation by spherical atoms and molecules. An electron exchange process is also suggested to give an important contribution to the total decay width of the transient collision complex in highly excited autoionizing states of (HeM)*.</jats:p>

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