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Harada Group

Professor HARADA, Yoshihisa
Synchrotron Radiation Laboratory, Laser and Synchrotron Research Center 
(concurrent with Functional Materials Group)
Adv. Mat., Frontier Sci.
Group's HP
Research Associate KIUCHI, Hisao

Research Subjects

  • Electronic structure analysis of aqueous solutions to study microheterogeneity and interaction at solid-liquid interfaces
  • Development of in situ soft X-ray spectroscopy for surface reaction of fuel cell catalysts, electrochemical reaction, photocatalytic reaction and functionality of metalloproteins
  • Study on the origin and observation of elementary excitations (crystal field excitation, spinon, magnon, charge density wave, orbiton) in strongly correlated materials
  • Basic study on ultrahigh energy resolution optics for soft X-ray emission and time-resolved spectroscopy

We explore the origin of the electronic structure of materials responsible for their electronic, magnetic and optical property using intense and energy tunable X-ray source: SPring-8, one of the most brilliant synchrotron facilities in the world. We have developed novel spectroscopies for material science in ‘soft’ X-ray region. We are leading the world’s soft X-ray emission spectroscopy, a kind of light scattering promising for electronic structure analyses of liquids and operando spectroscopy of a variety of catalysts. Our topics include a study on elementary excitations (crystal field excitation, spinon, magnon, charge density wave, orbiton etc.) in strongly correlated materials like Mott insulators and novel high-Tc superconductors, electronic structure analysis of aqueous solutions, interaction at solid-liquid interfaces, the surface reaction of fuel cell catalysts, electronic structure analysis of reaction center in metalloproteins, electrochemical and photocatalytic reactions. We also explore basic study on high performance soft X-ray absorption and emission spectroscopy for the next generation synchrotron light source.

High energy resolution soft X-ray angle resolved emission spectrometer constructed for University of Tokyo outstation beamline BL07LSU in SPring-8.
Soft X-ray emission spectroscopy has revealed that functional ionic liquid crystalline membranes with extremely uniform, nanometer-sized pores recognize the "hydrogen-bonded structure of water surrounding the ions" in order to selectively permeate specific ions.

Publications and Research Highlights