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RIKEN SPring-8 Center Soft X-Ray Spectroscopy Instrumentation Team

Team Leader: Masaki Oura (D.Sc.)

Research Summary

Masaki  Oura

Soft X-rays are known to be the most suitable light for investigating the electronic structures of various kinds of materials. The Soft X-ray Spectroscopy Instrumentation Team is primarily in charge of the development, improvement, and generalization of various spectroscopic tools as well as cutting-edge utilization technologies for soft X-ray spectroscopy, such as soft X-ray absorption, photoemission, and soft X-ray micro-spectroscopy, in order to advance optical and materials science by using the high brilliant soft X-ray undulator radiation from BL17SU at SPring-8. The team is also responsible for providing the infrastructure to improve user convenience. Furthermore, the team will contribute to the advancement of spectroscopic studies for materials science by means of time-resolved spectroscopy at next generation light sources, such as X-ray free electron lasers.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Engineering
  • Chemistry
  • Interdisciplinary Science & Engineering
  • Physics
  • Atomic and molecular science, Quantum electronics
  • Nanomaterial chemistry
  • Composite materials / Surface and interface technology


  • Soft x-ray microspectroscopy
  • Photoelectron / Auger electron spectroscopy
  • Soft x-ray photochemistry
  • Time-resolved spectroscopy

Selected Publications

  • 1. Boudjemia, N., Jänkälä, K., Gejo, T., Kohmura, Y., Huttula, M., Piancastelli, M.N., Simon, M., Oura, M., Püttner, R.:
    "Experimental and theoretical study of the Kr L-shell Auger decay"
    Phys. Rev. A104, 012804 (2021).
  • 2. Yamane, H., Oura, M., Takahashi, O., Ishihara, T., Yamazaki, N., Hasegawa, K., Ishikawa, T., Takagi, K., and Hatsui, T.:
    "Physical and chemical imaging of adhesive interfaces with soft x-rays"
    Commnications Materials 2, 63 (2021).
  • 3. Yamaguchi, A., Ohkochi, T., Oura, M., Yamada, K., Saiki, T., Suzuki, S., Utsumi, Y., and Nakao, A.:
    "X-ray photoemission spectroscopy study of uniaxial magnetic anisotropy induced in a Ni layer deposited on a LiNbO3 substrate"
    Nanomaterials 11, 1024 (2021).
  • 4. Verna, A., Stefani, G., Offi, F., Gejo, T., Tanaka, Y., Tanaka, K., Nishie, K., Nagaya, K., Niozu, A., Yamamura, R., Suenaga, T., Takahashi, O., Fujise, H., Togashi, T., Yabashi, M., and Oura, M.:
    "Photoemission from the gas phase using soft x-ray fs pulses : an investigation of the space-charge effects"
    New J. Phys. 22, 123029 (2020).
  • 5. Ishihara, T., Ohkochi, T., Yamaguchi, A., Kotani, Y., and Oura, M.:
    "Visualization of elemental distributions and local analysis of element-specific chemical states of an Arachnoidiscus sp. frustule using soft x-ray spectromicroscopy"
    PLOS ONE 15, e0243874 (2020).
  • 6. Oura, M., Ishihara, T., and Yamaguchi, A.:
    "Application of microprobe soft x-ray fluorescence and absorption spectroscopic analyses to characterize the buried multi-layered micro-structure"
    Jpn. J. Appl. Phys. 59, 060902 (2020).
  • 7. Boudjemia, N., Jänkälä, K., Puttner, R., Gejo, T., Journel, L., Kohmura, Y., Huttula, M., Piancastelli, M.N., Simon, M., and Oura, M.:
    "Deep-core photoionization of Kr atoms below and above the 1s ionization threshold"
    Phys. Rev. A101, 053405 (2020).
  • 8. Oura, M., Ishihara, T., Osawa, H., Yamane, H., Hatsui, T., and Ishikawa, T.:
    "Development of a scanning soft x-ray spectromicroscope to investigate the local electronic structure on the surface/interface of advanced materials under the conditions from low vacuum to helium atmosphere"
    J. Synchrotron Rad. 27, 664-674 (2020).
  • 9. Oura, M., Gejo, T., Nayaga, K., Kohmura, Y., Tamasaku, K., Journel, L., Piancastelli, M.N., and Simon, M.:
    "Hard x-ray photoelectron spectroscopy on heavy atoms and heavy-element containing molecules using synchrotron radiation up to 35 keV at SPring-8 undulator beamlines"
    New J. Phys. 21, 043015 (2019).
  • 10. Piancastelli, M.N., Jankala, K., Journel, L., Gejo, T., Kohmura, Y., Huttula, M., Simon, M., and Oura, M.:
    "X-ray versus Auger emission following Xe 1s photoionization"
    Phys. Rev. A95, 061402 (2017).

Recent Research Results

Lab Members

Principal investigator

Masaki Oura
Team Leader

Core members

Satoru Hamamoto
Research Associate

Contact Information

1-1-1 Kouto, Sayo-cho
Sayo-gun, Hyogo
679-5148 Japan
Email: oura [at] spring8.or.jp