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RIKEN SPring-8 Center SR Physics Unit

Unit Leader: Ichiro Inoue (Ph.D.)

Research Summary

Ichiro Inoue

We, SR Physics Unit, investigate the electronic states and structures of materials by utilizing the intense and coherent X-rays provided by SPring-8 and SACLA, while also working on generation of X-ray beams with unique properties. For example, we are developing technologies to compress the pulse duration of X-ray free-electron lasers into the attosecond (10-18 seconds) regime, and exploring novel X-ray optics based on nonlinear X-ray-matter interactions. By harnessing these unprecedented X-ray beams, we aim to enable the observation of ultrafast dynamics and exotic quantum states in matter, thereby opening up new frontiers in physics, chemistry, and life sciences.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Engineering
  • Mathematical & Physical Sciences
  • Quantum beam science
  • Nonlinear optics

Keywords

  • Ultrafast science
  • X-ray free-electron laser
  • Synchrotron radiation
  • X-ray optics

Selected Publications

  • 1. I. Inoue, T. Sato R. Robles, M. Seaberg, Y. Sun, D. Zhu, D. Cesar, Y. Ding, V. Esposito, V. Guo, A. Halavanau, T. Osaka, G. Yamaguchi, Y. Sano, K. Yamauchi, M. Yabashi, A. Marinelli, J. Yamada:
    "Nanofocused attosecond hard X-ray free-electron laser with intensity exceeding 1019 W/cm2",
    Optica 12, 309 (2025).
  • 2. I. Inoue, J. Yamada, K. J. Kapcia, M. Stransky, V. Tkachenko, Z. Jurek, T. Inoue, T. Osaka, Y. Inubushi, A. Ito, Y. Tanaka, S. Matsuyama, K. Yamauchi, M. Yabashi, B. Ziaja:
    "Femtosecond reduction of atomic scattering factors triggered by intense x-ray pulse"
    Phys. Rev. Lett. 131, 163201 (2023).
  • 3. I. Inoue, V. Tkachenko, K. J. Kapcia, V. Lipp, B. Ziaja, Y. Inubushi, T. Hara, M. Yabashi, E. Nishibori:
    "Delayed onset and directionality of x-ray-induced atomic displacements observed on subatomic length scale"
    Phys. Rev. Lett. 128, 223203 (2022).
  • 4. I. Inoue, Y. Inubushi, T. Osaka, J. Yamada, K. Tamasaku, H. Yoneda, M. Yabashi:
    "Shortening x-ray pulse duration via saturable absorption"
    Phys. Rev. Lett. 127, 163903 (2021).
  • 5. I. Inoue, Y. Deguchi, B. Ziaja, T. Osaka, M. M. Abdullah, Z. Jurek, N. Medvedev, V. Tkachenko, Y. Inubushi, H. Kasai, K. Tamasaku, T. Hara, E. Nishibori, M. Yabashi:
    "Atomic-scale visualization of ultrafast bond breaking in x-ray-excited diamond"
    Phys. Rev. Lett. 126, 117403 (2021).
  • 6. I. Inoue, T. Osaka, T. Hara, T. Tanaka, T. Inagaki, T. Fukui, S. Goto, Y. Inubushi, H. Kimura, R. Kinjo, H. Ohashi, K. Togawa, K. Tono, M. Yamaga, H. Tanaka, T. Ishikawa, M. Yabashi:
    "Generation of narrow-band X-ray free-electron laser via reflection self-seeding"
    Nature Photonics 13, 319 (2019).
  • 7. I. Inoue, Y. Inubushi, T. Sato, K. Tono, T. Katayama, T. Kameshima, K. Ogawa, T. Togashi, S. Owada, Y. Amemiya, T. Tanaka, T. Hara, M. Yabashi:
    "Observation of femtosecond X-ray interactions with matter using an X-ray–X-ray pump–probe scheme"
    Proc. Natl. Acad. Sci. USA 113, 1492 (2016).

Related Links

Lab Members

Principal investigator

Ichiro Inoue
Unit Leader

Contact Information

1-1-1 Kouto, Sayo-cho
Sayo-gun, Hyogo
679-5148 Japan
Email: inoue@spring8.or.jp

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