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Development adjacent-element-selective spectroscopy using synchrotron hard x-rays

Research Project

Project/Area Number 21K19035
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
Research InstitutionNational Institutes for Quantum Science and Technology

Principal Investigator

Ishii Kenji  国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所 放射光科学研究センター, 上席研究員 (40343933)

Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2021: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Keywords放射光X線分光 / X線吸収分光 / X線発光分光 / X線分光 / 量子ビーム
Outline of Research at the Start

本研究では、化学結合した隣接元素を選択して電子状態を観測することができる、新しい原理に基づく放射光硬X線分光法の開発を目指す。具体的には、金属酸化物において酸素1s/2s軌道にある電子が隣接金属の1s軌道のホールを埋める際の交差遷移による発光を分光することで酸素吸収端の吸収スペクトルと同等の情報を硬X線で取得し、さらに、それが酸素の価数変化に対しどこまで敏感かを定量的に明らかにする。

Outline of Final Research Achievements

The aim of this study was to develop a new synchrotron hard x-ray spectroscopy method based on a novel principle that allows to select a chemically bonded adjacent element and observe the electronic states of the element. By measuring the cross-transition in a transition metal oxide, where an oxygen 1s electron fills the core hole of a transition metal 1s orbital, it becomes possible to distinguish adjacent elements. Although attempts were made in NiO and there is a possibility that the target cross-transition component was captured, it was concluded that the intensity of this component is extremely weak compared to the x-ray Raman scattering and the tail of fluorescent x-rays, making it currently difficult to discuss the electronic states.

Academic Significance and Societal Importance of the Research Achievements

放射光X線を利用した分光法は、光源の発展に伴って新たな方法が生まれ、物質の電子状態に関する新たな情報を提供してきた。本研究は、その流れに沿った新しい原理に基づく分光法の開発を目指したものであり、実現すれば、多くの物質・材料での活用が期待された。残念ながら現時点では実現は困難という結論となったものの、このような研究を継続することでまた新たなアイディアが生まれ、科学技術の発展に繋がるものと考えている。

Report

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

    (5 results)

All 2024 2023

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

  • [Journal Article] Investigation of hydrogen superoxide adsorption during ORR on Pt/C catalyst in acidic solution for PEFC by in-situ high energy resolution XAFS2023

    • Author(s)
      Yamamoto Naoki、Matsumura Daiju、Hagihara Yuto、Tanaka Kei、Hasegawa Yuta、Ishii Kenji、Tanaka Hirohisa
    • Journal Title

      Journal of Power Sources

      Volume: 557 Pages: 232508-232508

    • DOI

      10.1016/j.jpowsour.2022.232508

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Experimental and Theoretical Investigation of High-Resolution X-ray Absorption Spectroscopy (HR-XAS) at the Cu K-Edge for Cu2ZnSnSe42023

    • Author(s)
      Xu Wei、Zhang Yujun、Ishii Kenji、Wadati Hiroki、Zhu Yingcai、Guo Zhiying、Diao Qianshun、Hong Zhen、Han Haijiao、Zhao Lidong
    • Journal Title

      Condensed Matter

      Volume: 8 Issue: 1 Pages: 8-8

    • DOI

      10.3390/condmat8010008

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ルビジウム化合物に対する高エネルギー分解能蛍光検出X線吸収微細構造(HERFD-XAFS)測定 ―生体内ウランの化学形の評価法の前検討として"2023

    • Author(s)
      佐藤遼太朗、上原章寛、 大澤大輔、石井賢司、松村大樹、沼子千、 及川将一、武田(本間)志乃
    • Journal Title

      X線分析の進歩

      Volume: 54 Pages: 193-201

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] 価電子内殻遷移X線発光分光を利用した銅酸化物超伝導体のキャリア濃度評価2024

    • Author(s)
      石井賢司、藤田全基
    • Organizer
      第37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
      2023 Annual Research Report
  • [Presentation] 価電子内殻遷移X線発光分光を利用した銅酸化物超伝導体のキャリア濃度評価2023

    • Author(s)
      石井賢司、藤田全基
    • Organizer
      第26回XAFS討論会
    • Related Report
      2023 Annual Research Report

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Published: 2021-07-13   Modified: 2025-01-30  

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