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

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K19035
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: National 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
• Keywords: 放射光Ｘ線分光

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.

Free Research Field

放射光Ｘ線分光

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。