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Anomalous behavior of the cross sections for electron scattering from hydrogen molecule in the ultra-low-energy region

Research Project

Project/Area Number 17K05594
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Atomic/Molecular/Quantum electronics
Research InstitutionTokyo Institute of Technology

Principal Investigator

Kitajima Masashi  東京工業大学, 理学院, 准教授 (20291065)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords超低エネルギー電子衝突 / 衝突断面積 / 放射光 / Cold Electron Collision / 電子衝突断面積 / 電子散乱 / 電子Cold Collision / 超低エネルギー電子ビーム / 原子・分子物理 / プラズマ・核融合 / 量子ビーム
Outline of Final Research Achievements

The scattering of low-energy electrons by atoms and molecules has been the subject of extensive experimental and theoretical investigations. When the collision energy is very low, the de Broglie wavelength of electrons becomes very much greater than the typical size of an atom or a molecule. In this ultra-low-energy regime, collision time becomes comparable to the time scale of molecular vibration and rotation which may also lead to a interesting physical phenomena. In this study, we measured the total cross sections for electron scattering from H2, HD, and D2 at very-low energies where effect of the molecular-motions such as vibration and rotation of hydrogen molecules may show up in the total cross sections.
The measured total cross sections for electron scattering from H2, HD, and D2 in the energy region of 10 meV to 20 eV showed very interesting isotope effects especially at the very-low energy region below 100 meV.

Academic Significance and Societal Importance of the Research Achievements

水素分子は最も簡単な分子であり、電子-水素分子衝突は量子力学における散乱理論モデルの検証という点で最も優れた系である。このような最も基礎的な系で、超低エネルギーにおいては、これまで広範な系に適用されてきた理論モデルの破綻が明らかになったことは重要である。
さらに、電子-原子・分子衝突により引き起こされる過程は、自然界から身の回りの製品に至るまで広く応用され、広範な分野の基礎過程である。特に、室温以下のエネルギーに対応する超低エネルギー電子衝突全断面積は不足しており、本研究による研究は極めて重要な物理量を与えるものである。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (14 results)

All 2019 2018 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (11 results) (of which Int'l Joint Research: 3 results,  Invited: 4 results) Remarks (2 results)

  • [Journal Article] Total cross-section for low-energy and very low-energy electron collisions with O22019

    • Author(s)
      Okumura T、Kobayashi N、Sayama A、Mori Y、Akasaka H、Hosaka K、Odagiri T、Hoshino M、Kitajima M
    • Journal Title

      Journal of Physics B: Atomic, Molecular and Optical Physics

      Volume: 52 Issue: 3 Pages: 035201-035201

    • DOI

      10.1088/1361-6455/aaf48d

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Low-energy and Very-low-energy total cross sections for electron collisions with small molecules2019

    • Author(s)
      M Kitajima, T. Ejiri, T. Okumura, D. Itoh, K. Hosaka, T. Odagiri and M. Hoshino
    • Organizer
      XX International Workshop on Low-Energy Positron and Positronium Physics, XXI International Symposium on Electron-Molecule Collisions and Swarms (POSMOL2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] High-resolution measurements of total cross section for very-low-energy electron collisions with molecules2019

    • Author(s)
      Masashi Kitajima
    • Organizer
      International Workshop on Atomic and Molecular Data for Plasma Applications, Satellite Workshop of XXXIV ICPIG & ICRP-10
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 高分解能超低エネルギー電子ビームによるCH4およびNH3の電子衝突全断面積測定2019

    • Author(s)
      江尻智一,奥村拓馬,伊藤大智,穂坂綱一,小田切丈,星野正光, 北島昌史
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] しきい光電子源を用いた超低エネルギー電子-CH4, NH3衝突全断面積の測定2019

    • Author(s)
      江尻智一,奥村拓馬,伊藤大智,穂坂綱一,北島昌史, 小田切丈,星野正光
    • Organizer
      2018量子ビームサイエンスフェスタ
    • Related Report
      2018 Research-status Report
  • [Presentation] 放射光の二次ビーム利用:超低速電子ビームを用いた電子-分子衝突実験2019

    • Author(s)
      北島昌史
    • Organizer
      第32回日本放射光学会年会・放射光科学合同シンポジウム
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] CH4、NH3 を標的とした高分解能低エネルギー電子衝突全断面積測定2018

    • Author(s)
      江尻智一,奥村拓馬,伊藤大智,穂坂綱一,北島昌史,小田切丈,星野正光
    • Organizer
      原子衝突学会第43回年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 水素分子の超低エネルギー電子衝突全断面積に現れる同位体効果2018

    • Author(s)
      奥村拓馬,江尻智一,穂坂綱一,北島昌史,小田切丈,星野正光
    • Organizer
      原子衝突学会第43回年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 水素分子の超低エネルギー電子衝突全断面積における同位体効果2018

    • Author(s)
      奥村拓馬, 江尻智一, 赤坂博史, 穂坂綱一, 北島昌史, 小田切丈,星野正光
    • Organizer
      第12回分子科学討論会
    • Related Report
      2018 Research-status Report
  • [Presentation] Very-low energy electron collision with H2, HD, and D22018

    • Author(s)
      T. Okumura, T. Ejiri, K. Hosaka, M. Kitajima, T. Odagiri and M. Hoshino
    • Organizer
      13th Asian International Seminar on Atomic and Molecular Physics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] しきい光電子源を用いた超低エネルギー電子-HD衝突全断面積の測定2018

    • Author(s)
      奥村拓馬, 赤坂博史, 江尻智一, 穂坂綱一, 北島昌史, 小田切丈, 星野正光, 田中大
    • Organizer
      量子ビームサイエンスフェスタ, 第35回PFシンポジウム
    • Related Report
      2017 Research-status Report
  • [Presentation] HDの超低エネルギー電子衝突全断面積2018

    • Author(s)
      奥村拓馬, 赤坂博史, 江尻智一, 穂坂綱一, 北島昌史, 小田切丈, 星野正光
    • Organizer
      日本物理学会 第73回年次大会
    • Related Report
      2017 Research-status Report
  • [Remarks] 東京工業大学理学院化学系北島研究室

    • URL

      http://www.chemistry.titech.ac.jp/~kitajima/index.html

    • Related Report
      2019 Annual Research Report
  • [Remarks] 河内・北島研究室

    • URL

      http://www.chemistry.titech.ac.jp/~kouchi/index.html

    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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