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Study of chemical reactions of negative molecular ions in the space environment probed by the state-of-the-art neutral molecule detector

Research Project

Project/Area Number 20K15238
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 32010:Fundamental physical chemistry-related
Research InstitutionTokyo Metropolitan University (2021-2022)
Institute of Physical and Chemical Research (2020)

Principal Investigator

Okumura Takuma  東京都立大学, 理学研究科, 助教 (70855030)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords超伝導検出器 / 中性分子検出器 / イオン蓄積リング / 負イオン / 星間分子反応 / 原子分子物理 / 負イオン共鳴状態
Outline of Research at the Start

近年の観測から、宇宙空間には従来の予想を大きく超える量の分子負イオンが存在することが分かってきた。宇宙空間における分子負イオンの化学を解き明かすべく、本研究では、宇宙環境を実験室で再現し、負イオンの光解離反応の直接観測を行う。本研究では、地上での宇宙環境構築のために最先端技術である極低温静電型イオン蓄積リングを導入し、また近年躍進的発展を遂げている超伝導検出器TESを世界で初めて中性分子検出のために利用する。本研究は、宇宙における分子進化を解明するための礎となるだけでなく、新たな先端検出器の導入により分子科学の常識を一変させるものとなる。

Outline of Final Research Achievements

The purpose of this study is to develop a new experimental apparatus for directly observing photochemical reactions of negative ions in the space environment by combining a cryogenic electrostatic ion storage ring developed in RIKEN (RICE) and state-of-the-art superconducting transition-edge microcalorimeters (TES) for detecting neutral molecules produced by the reactions. This was the first attempt to employ a TES as a neutral-molecule detector. By thoroughly reducing effects of black-body radiations, I succeeded in demonstrating neutral-molecule detections by the TES, particularly observing dissociation processes of diatomic molecular ions. However, a mass resolution of the TES detector is still not sufficient for measurements of general chemical reactions of negative molecular ions, and further improvements are currently underway.

Academic Significance and Societal Importance of the Research Achievements

中性分子を高質量分解能検出する技術はこれまでいくつか考案されているが、適用可能な分子が限定されるなど問題点も多く、汎用的で高質量分解な中性分子検出法が長く切望されてきた。本研究で原理実証に成功したTESによる中性分子検出器は、適用可能な分子に制限はなく、更なる分解能の向上を実現できれば汎用中性分子検出器として極めて有望である。本研究による新たな中性分子検出技術の確立は、化学反応の実験研究の常識を一変させることに繋がり、また基礎物理化学を超えて工学や生物学など広く他分野にまで影響が波及することが期待できる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (21 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (3 results) Journal Article (8 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results,  Open Access: 5 results) Presentation (10 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Int'l Joint Research] NIST(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] NIST(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] NIST(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Proof-of-Principle Experiment for Testing Strong-Field Quantum Electrodynamics with Exotic Atoms: High Precision X-Ray Spectroscopy of Muonic Neon2023

    • Author(s)
      T. Okumura, T. Azuma, D. A. Bennett, I. Chiu, W. B. Doriese, M. S. Durkin, J. W. Fowler, J. D. Gard, T. Hashimoto, R. Hayakawa, G. C. Hilton, Y. Ichinohe, P. Indelicato, T. Isobe, S. Kanda, M. Katsuragawa, N. Kawamura, Y. Kino, K. Mine, Y. Miyake, K. M. Morgan, K. Ninomiya et al.
    • Journal Title

      Physical Review Letters

      Volume: 130 Issue: 17 Pages: 173001-173001

    • DOI

      10.1103/physrevlett.130.173001

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High-sensitive XANES analysis at Ce L2-edge for Ce in bauxites using transition-edge sensors: Implications for Ti-rich geological samples2023

    • Author(s)
      Li Wenshuai、Yamada Shinya、et al.
    • Journal Title

      Analytica Chimica Acta

      Volume: 1240 Pages: 340755-340755

    • DOI

      10.1016/j.aca.2022.340755

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Electronic K x rays emitted from muonic atoms: An application of relativistic density-functional theory2023

    • Author(s)
      XM Tong, D Kato, T Okumura, S Okada, and T Azuma
    • Journal Title

      Physical Review A

      Volume: 107 Issue: 1 Pages: 012804-012804

    • DOI

      10.1103/physreva.107.012804

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The cerium isotope fingerprints of redox fluctuation in bauxites2023

    • Author(s)
      W. Li, X. M. Liu, R. Nakada, Y. Takahashi, Y. Hu, M. Shakouri, Z. Zhang, T. Okumura, S. Yamada
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 602 Pages: 117962-117962

    • DOI

      10.1016/j.epsl.2022.117962

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Application of Deep Learning to the Evaluation of Goodness in the Waveform Processing of Transition-Edge Sensor Calorimeters2022

    • Author(s)
      Y. Ichinohe et al.
    • Journal Title

      J. Low Temp. Phys.

      Volume: - Issue: 5-6 Pages: 02719-02719

    • DOI

      10.1007/s10909-022-02719-7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Deexcitation Dynamics of Muonic Atoms Revealed by High-Precision Spectroscopy of Electronic K X Rays2021

    • Author(s)
      T. Okumura et al.
    • Journal Title

      Physical Review Letters

      Volume: 127 Issue: 5 Pages: 053001-053001

    • DOI

      10.1103/physrevlett.127.053001

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dynamical Response of Transition-Edge Sensor Microcalorimeters to a Pulsed Charged-Particle Beam2021

    • Author(s)
      Okumura Takuma、Azuma Toshiyuki、Bennett Douglas A.、Caradonna Pietro、Chiu I-Huan、Doriese W. Bertrand、Durkin Malcolm S.、Fowler Joseph W.、Gard Johnathon D.、Hashimoto Tadashi、Hayakawa Ryota、Hilton Gene C.、Ichinohe Yuto、Indelicato Paul et al.
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Issue: 5 Pages: 1-4

    • DOI

      10.1109/tasc.2021.3067793

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Transition-Edge Sensor Optimization for Hard X-ray Applications2021

    • Author(s)
      Yan Daikang、Yamada Shinya、et al.
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Issue: 5 Pages: 1-5

    • DOI

      10.1109/tasc.2021.3059972

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ミュオニックAr多価イオンの形成ダイナミクス2023

    • Author(s)
      奥村拓馬
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 宇宙環境下における分子イオン反応の観測を目指して:超伝導検出器による質量分析 IV2022

    • Author(s)
      奥村拓馬
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] H, He, Li様ミュオニックAr原子の形成2022

    • Author(s)
      奥村拓馬
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] High-resolution spectroscopy of electronic K x rays from muonic atoms2022

    • Author(s)
      T. Okumura
    • Organizer
      20th International Conference on the Physics of Highly Charged Ions
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 宇宙環境下における分子イオン反応の観測を目指して:超伝導検出器による質量分析III2021

    • Author(s)
      奥村拓馬
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 超伝導転移端検出器を用いた中性分子検出器の開発2021

    • Author(s)
      須田博貴
    • Organizer
      原子衝突学会第46回年会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 宇宙環境下における分子イオン反応の観測: 超伝導検出器による質量分析II2021

    • Author(s)
      奥村拓馬
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 超伝導カロリメータを用いた低温下の星間分子計測実験 (2)2021

    • Author(s)
      須田博貴
    • Organizer
      日本天文学会2021年春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 宇宙環境下における分子イオン反応の観測を目指して:超伝導検出器による質量分析2020

    • Author(s)
      奥村拓馬
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 超伝導転移端検出器による中性分子の質量分析2020

    • Author(s)
      須田博貴
    • Organizer
      原子衝突学会第45回年会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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