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Negative ion emission in Coulomb explosion of molecules

Research Project

Project/Area Number 21H01055
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 14010:Fundamental plasma-related
Research InstitutionKyoto University

Principal Investigator

Majima Takuya  京都大学, 工学研究科, 准教授 (50515038)

Co-Investigator(Kenkyū-buntansha) 寺本 高啓  大阪大学, 放射線科学基盤機構, 特任講師(常勤) (40467056)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2023: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2022: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Keywordsイオンビーム / MeV重イオン / 負イオン / クーロン爆発 / 高強度レーザー
Outline of Research at the Start

光吸収や粒子との衝突に伴って分子が解離するとき,負の電荷を持った解離イオンが生成されることがある.これは,最も基礎的な原子分子過程のひとつとして,これまで多くの研究が積み上げられてきた.これまでに知られている負解離イオンの生成過程は,主に, 解離性電子付着などの負の前駆体イオンから解離に至る過程と,高励起状態にある中性分子の正負イオンの対生成の二つに大別される.申請者は最近,高エネルギー重イオン衝突において,分子クーロン爆発に伴う新たな負解離イオン生成があることを発見した.本研究では,この新たな負イオン生成過程のメカニズムの解明を目的に,解離ダイナミクスや生成確率の情報を得る.

Outline of Final Research Achievements

A three-dimensional momentum imaging spectroscopy system was constructed to understand the mechanism of ion emission associated with high-energy heavy ion collisions. Optimal lens conditions for imaging were determined using simple gas molecular targets. A molecular introduction line from a liquid sample was constructed and completed to measure fragment ions from water molecules in the gas phase. Production cross-sections were obtained as a function of the projectile energy. We also performed mass spectrometry on several ion species produced from various polyatomic molecules and found new delayed dissociation channels. In experiments with intense laser pulses, multiphoton ionization experiments were performed with a reflectron-type time-of-flight mass spectrometer.

Academic Significance and Societal Importance of the Research Achievements

高エネルギー荷電粒子との衝突や光吸収に伴って気相分子から正負の解離イオンが生成される過程は、最も基礎的な分子反応素過程のひとつとして、これまで多くの研究が積み上げられてきた。プラズマ中の気相反応や放射線化学・生物、大気化学、星間化学などにおける基礎過程として重要なだけでなく、原子・分子の電子状態を調べるための反応としても有効性が高い。本研究は高エネルギー重イオンと多原子分子の衝突系に着目し、同時測定などの高度な計測技術を展開して複雑な過程を明らかにすることにより、長い研究の歴史の中で見落とされていた新奇な過程に光を当てるものである。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (20 results)

All 2024 2023 2022 2021 Other

All Journal Article (3 results) Presentation (16 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Fragmentation of Gas-phase Nucleobases by MeV-ion Irradiation2023

    • Author(s)
      T. Nakao, T. Majima, R. Takasu, H. Tsuchida, and M. Saito
    • Journal Title

      Annual Report of Quantum Science and Engineering Center

      Volume: 25 Pages: 7-8

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Measurement of Fragment Ions from Adenine Molecules in Fast Heavy-Ion Collisions2022

    • Author(s)
      T. Nakao, T. Majima, R. Takasu, H. Tsuchida, and M. Saito
    • Journal Title

      Annual Report of Quantum Science and Engineering Center

      Volume: 24 Pages: 3-5

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Measurements of Fragment ions from Water Molecules in Fast Heavy-ion Collisions2021

    • Author(s)
      R. Takasu, T. Majima, K. Ueno, H. Tsuchida, and M. Saito
    • Journal Title

      Annual Report of Quantum Science and Engineering Center

      Volume: 23 Pages: 12-13

    • Related Report
      2021 Annual Research Report
  • [Presentation] 高速重イオン衝突に伴うアルコール分子の遅延解離過程における内部エネルギー評価2024

    • Author(s)
      中尾友彦, 間嶋拓也, 土田秀次, 斉藤学
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Lifetime measurement of collision-induced delayed fragmentation from singly charged intermediated ions2023

    • Author(s)
      T. Nakao, R. Takasu, S. Li, H. Tsuchida, M. Saito, and T. Majima
    • Organizer
      XXXIII International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC33)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高速イオン衝突に伴う炭化水素分子の遅延解離経路2023

    • Author(s)
      中尾友彦,間嶋拓也,土田秀次,斉藤学
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Delayed fragmentation of doubly ionized hydrocarbon molecules induced by fast heavy-ion irradiation2023

    • Author(s)
      T. Nakao, T. Majima, H. Tsuchida, and M. Saito
    • Organizer
      量子理工学教育研究センター第24回公開シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 高速重イオン衝突に伴う気相アルコール分子の遅延解離現象2023

    • Author(s)
      中尾友彦, 間嶋拓也, 土田秀次, 斉藤学
    • Organizer
      原子衝突学会第48回年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Delayed fragmentation of biomoleculesinduced by MeV ion collisions2023

    • Author(s)
      T. Nakao, R. Takasu, S. Li, H. Tsuchida, M. Saito and T. Majima
    • Organizer
      The 14th Asian International Seminar on Atomic and Molecular Physics
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Lifetime measurement of collision-induced delayed fragmentation from singly charged intermediated ions2023

    • Author(s)
      T. Nakao, R. Takasu, S. Li, H. Tsuchida, M. Saito, and T. Majima
    • Organizer
      33th International Conference on Photonic, Electronic and Atomic Collisions
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MeV 重イオン衝突によって気相水分子から生成される正負イオンの測定2023

    • Author(s)
      高須理世音,間嶋拓也,寺本高啓,中尾友彦,李思瑶,土田秀次,斉藤学
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 高速イオン衝突に伴う核酸塩基分子の遅延解離経路 II2023

    • Author(s)
      中尾友彦,間嶋拓也,高須理世音,李思瑶,土田秀次,斉藤学
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Delayed fragmentation of nucleobases following MeV ion collisions2022

    • Author(s)
      T. Nakao, R. Takasu, H. Tsuchida, M. Saito, and T. Majima
    • Organizer
      20th International Conference on the Physics of Highly Charged Ions
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高速イオン衝突に伴う核酸塩基分子の遅延解離経路2022

    • Author(s)
      中尾友彦,間嶋拓也,高須理世音,土田秀次,斉藤学
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Fragmentation of gas-phase nucleobases by MeV-ion irradiation2022

    • Author(s)
      T. Nakao, T. Majima, R. Takasu, H. Tsuchida, and M. Saito
    • Organizer
      量子理工学教育研究センター第23回公開シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 高速イオン衝突による気相アデニン・グアニン分子の解離経路2022

    • Author(s)
      中尾友彦,間嶋拓也,髙須理世音,土田秀次,斉藤学
    • Organizer
      日本原子力学会2022年春の年会 学生ポスターション
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高速イオン衝突に伴う気相アデニン分子の遅延解離経路2022

    • Author(s)
      中尾友彦,間嶋拓也,髙須理世音,土田秀次,斉藤学
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Measurement of fragment ions from adenine molecules in fast heavy-ion collisions2021

    • Author(s)
      T. Nakao, T. Majima, R. Takasu, H. Tsuchida, and M. Saito
    • Organizer
      量子理工学教育研究センター第22回公開シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高速重イオン衝突により気相水分子から生成するイオンの測定2021

    • Author(s)
      髙須理世音,間嶋拓也,上野公希,土田秀次,斉藤学
    • Organizer
      量子理工学教育研究センター第22回公開シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Remarks] 京都大学大学院工学研究科原子核工学専攻量子ビーム科学(3-1)加速器グループ

    • URL

      http://www.nucleng.kyoto-u.ac.jp/Groups/Gr3/

    • Related Report
      2023 Annual Research Report 2022 Annual Research Report 2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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