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Time-resolved electron spin resonance spectroscopy of integer-spin reaction intermediates using terahertz waves

Research Project

Project/Area Number 21H01040
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionKobe University

Principal Investigator

Ohmichi Eiji  神戸大学, 理学研究科, 准教授 (00323634)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2023: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2022: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Keywords電子スピン共鳴 / テラヘルツ波 / 時間分解測定 / 反応中間体 / 整数スピン / 遷移金属イオン / 時間分解電子スピン共鳴 / 整数スピン系
Outline of Research at the Start

本研究では光触媒反応や金属タンパク質酵素反応において重要な役割を担っている整数スピン(S=1,2..)系に対し、時間分解電子スピン共鳴(Time-resolved ESR)測定を可能にする新しい装置開発を行う。この目的のため、透過型テラヘルツESR測定系にナノ秒パルスレーザーと高速検出器を組み合わせた測定系を構築する。この装置開発によりこれまで未開拓であった遷移金属イオンに由来する整数スピン反応中間体の補足が可能になり、その時間発展を明らかにすることができる。

Outline of Final Research Achievements

In order to establish a novel technique for time-resolved electron spin resonance (ESR) spectroscopy in the terahertz (THz) region, we developed the THz-ESR measurement system combined with a nanosecond pulse laser. Finally, the system with a time resolution of 10 ns was developed at cryogenic temperatures. Also, in order to increase the sensitivity, we fabricated metallic planar antennas to enhance the oscillating magnetic field components of THz waves. According to the numerical simulations, a 100-fold increase of the oscillating magnetic field was attained in a wide frequency range. We paid attention to the interaction between ferrous irons (S=2) and the amyloid β protein, which is thought to be responsible for the emergence of Alzheimer diseases. Preliminary X-band ESR measurements are suggestive of the important role of integer spins in the interactions between iron ions and amyloid β.

Academic Significance and Societal Importance of the Research Achievements

時間分解電子スピン共鳴法はマイクロ秒の時間分解能で短寿命反応中間体を捕捉できる優れた分光法である。しかし、従来法ではXバンド帯で測定を行っていることからゼロ磁場分裂と呼ばれるエネルギーギャップを持つような整数スピン状態に対しては測定が不可能であった。しかし、多くの遷移金属イオン(Cr4+、Mn3+、Fe4+、Fe2+、Ni2+)では整数スピン状態をとり、触媒・酵素反応において極めて重要な役割を担っていることが知られている。本研究により未開拓であった遷移金属イオンの時間分解電子スピン共鳴測定が可能になれば光触媒反応や金属タンパク質酵素反応の反応機構解明に向けた手掛かりを得ることが可能になる。

Report

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

    (14 results)

All 2023 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (13 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Frequency-Domain Antiferromagnetic Resonance Spectroscopy of NiO2022

    • Author(s)
      Eiji Ohmichi, Yuto Shoji, Hideyuki Takahashi , and Hitoshi Ohta
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 9

    • DOI

      10.7566/jpsj.91.095001

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] アミロイドβ-金属イオン間相互作用のESR分光2023

    • Author(s)
      小泉一樹、大道英二、太田仁
    • Organizer
      第62回電子スピンサイエンス学会年会(SEST2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] ジャイロトロンを用いた力検出型THz ESRの開発と応用2023

    • Author(s)
      大道英二
    • Organizer
      第62回電子スピンサイエンス学会年会(SEST2023)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] テラヘルツ領域における振動磁場増強ディアボロ型ナノアンテナの設計2023

    • Author(s)
      滝川稜人、伊郷祐馬、大道英二、太田仁
    • Organizer
      第62回電子スピンサイエンス学会年会(SEST2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] テラヘルツ帯ESR測定用ディアボロ型アンテナの作製2023

    • Author(s)
      伊郷祐馬、滝川稜人、大道英二、太田仁
    • Organizer
      第62回電子スピンサイエンス学会年会(SEST2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] テラヘルツ帯ディアボロ型アンテナの作製とシミュレーション2023

    • Author(s)
      伊郷祐馬、滝川稜人、大道英二、太田仁
    • Organizer
      第32回日本赤外線学会研究発表会
    • Related Report
      2023 Annual Research Report
  • [Presentation] High-Resolution Frequency-Domain Electron Paramagnetic Resonance Spectroscopy in the Terahertz Region2021

    • Author(s)
      Y. Shoji, E. Ohmichi, H. Takahashi, H. Ohta
    • Organizer
      22nd International Society of Magnetic Resonance Conference, 9th Asia-Pacific NMR Symposium (APNMR9), ISMAR-APNMR2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-Frequency Electron Paramagnetic Resonance Technique for Spectroscopic Studies of Metalloproteins under Pressure2021

    • Author(s)
      S. Masuda, E. Ohmichi, T. Sakurai, H. Takahashi, H. Ohta
    • Organizer
      22nd International Society of Magnetic Resonance Conference, 9th Asia-Pacific NMR Symposium (APNMR9), ISMAR-APNMR2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Terahertz Electron Paramagnetic Resonance Spectroscopy Using Compact Frequency-Tunable Photomixing Devices2021

    • Author(s)
      E. Ohmichi, Y. Shoji, H. Takahashi, H. Ohta
    • Organizer
      22nd International Society of Magnetic Resonance Conference, 9th Asia-Pacific NMR Symposium (APNMR9), ISMAR-APNMR2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of the field-angle-dependent high-frequency ESR spectroscopy based on thermal detection method2021

    • Author(s)
      H. Takahashi, T. Sakurai, E. Ohmichi, H. Ohta
    • Organizer
      22nd International Society of Magnetic Resonance Conference, 9th Asia-Pacific NMR Symposium (APNMR9), ISMAR-APNMR2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-Resolution Frequency-Domain Terahertz Spectroscopy And Its Application To Electron Paramagnetic Resonance2021

    • Author(s)
      Y. Shoji, E. Ohmichi, H. Takahashi, H. Ohta
    • Organizer
      46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 連続波長可変テラヘルツ光源を用いた周波数掃引型反強磁性共鳴分光法の開発2021

    • Author(s)
      小路悠斗、大道英二、髙橋英幸、太田仁
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 連続波長可変テラヘルツ光源による高分解能周波数領域電子スピン共鳴法の開発2021

    • Author(s)
      小路悠斗、大道英二、髙橋英幸、太田仁
    • Organizer
      第30回日本赤外線学会研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 圧力下におけるタンパク質の高周波電子スピン共鳴分光2021

    • Author(s)
      増田祥大、大道英二、櫻井敬博、髙橋英幸、太田仁
    • Organizer
      第30回日本赤外線学会研究発表会
    • Related Report
      2021 Annual Research Report

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

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