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Doubly excited states of molecular nitrogen by scattered electron-ion coincidence measurements

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Abstract

Scattered electron-ion coincidence measurements were performed on molecular nitrogen (N2) to study the relaxation dynamics of doubly excited states. Doubly excited states are typically so unstable that they result in either auto-ionization or a neutral dissociation. In auto-ionization, ionization and dissociation typically occur. Using a mixed-gas method, we determined the absolute values of the generalized oscillator strength (GOS) distributions using an incident electron energy of 200 eV and a scattering angle of 6°. The GOS distributions of N2 + and N+ were determined by combining the coincidence ion signals, which revealed some doubly excited states of N2. Since electron impact experiments can provide information on optically forbidden transitions, the contribution of optically forbidden states appears in the GOS distributions of both N2 + and N+. We observed auto-ionization and dissociative auto-ionization induced by excitation to the optically forbidden doubly excited states in the range of 30–40 eV.

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Authors and Affiliations

  1. Dept. of Phys., Toho University, Miyama, Funabashi, 274-8510, Chiba, Japan

    Karin Takahashi, Toru Hasegawa & Yasuhiro Sakai

  2. Research Center for Materials with Integrated Properties, Toho University, Miyama, Funabashi, 274-8510, Chiba, Japan

    Yasuhiro Sakai

Authors
  1. Karin Takahashi
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  2. Toru Hasegawa
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  3. Yasuhiro Sakai
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Correspondence to Karin Takahashi.

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Takahashi, K., Hasegawa, T. & Sakai, Y. Doubly excited states of molecular nitrogen by scattered electron-ion coincidence measurements. Eur. Phys. J. D 71, 48 (2017). https://doi.org/10.1140/epjd/e2017-70465-7

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  • DOI: https://doi.org/10.1140/epjd/e2017-70465-7

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