Ayana Sato-Tomita

School of Medicine, Jichi Medical University
Assistant Professor
A02
A02-03

Research AreasChemistry and Material Science, Structural Biology

Observation of Reaction Transient against External Fields in Soft Crystals using X-ray Molecular Movie

Keywords
Molecular Movie, Soft Crystals, Time-Resolved, X-ray Crystallography, X-ray absorption spectroscopy, Photoelectron microscopy
Co-Researcher
Co-Investigator: Keiki Fukumoto (Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Assistant Professor)
Collaborator: Shin-ichi Adachi (Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Professor)
Collaborator: Shunsuke Nozawa (Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Associate Professor)
Collaborator: Kouhei Ichiyanagi (Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Researcher)
Collaborator: Ryo Fukaya (Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Assistant Professor)
Collaborator: Yasufumi Umena (School of Medicine, Jichi Medical University, Doctor Student)

Research Outline

Novel functional-materials, “Soft crystals,” produces a phase transition or luminescence-property change by weak external-fields, which are photo irradiation, vapor exposure, mechanical pushing, and others. We explore a time-resolved structural-change in an atomic level or electronic state during phase transition in soft crystals using ‘X-ray molecular movie’ to understand mechanisms of the functions. A pump-probe experiment is executed with LASER pumping to generate intermediate states of photo excitation, pressure impress, thermal jump, and so on. X-ray free electron laser (XFEL) and pulsed synchrotron-radiation are used for a probing in a range of time scale from femtosecond to minute. We advance an appropriate system for each soft crystal, i.e., multi-probing which are X-ray crystallography, X-ray absorption spectroscopy, X-ray scattering and photoelectron microscopy.

Beamline NW14A at KEK PF-AR

Representative Achievements

  • Direct Observation of Bond Formation in Solution with Femtosecond X-Ray Scattering
    Kim, K.H.; Kim, J.G.; Nozawa, S.; Sato, T.; Oang, K.Y.; Kim, T.W.; Ki, H.; Jo, J.; Park, S.; Song, C.; Sato, T.; Ogawa, K.; Togashi, T.; Tono, K.; Yabashi, M.; Ishikawa, T.; Kim, J.; Ryoo, R.; Kim, J.; Ihee, H.; Adachi, S. Nature 2015, 518, 385-389.
    DOI: 10.1038/nature14163
  • Lifetimes of photogenerated electrons on a GaAs surface affected by nanostructural defects
    Fukumoto, K.; Yamada, Y.; Koshihara, S.; Onda, K.; Appl. Phys. Express  2015, 8, 101201(4).
    DOI: 10.7567/APEX.8.101201
  • Reversible Phase Transition in Laser-Shocked 3Y-TZP Ceramics Observed via Nanosecond Time-Resolved X-Ray Diffraction
    Hu, J.; Ichiyanagi, K.; Takahashi, H.; Koguchi, H.; Akasaka, T.; Kawai, N.; Nozawa, S.; Sato, T.; Sasaki, Y.C.; Adachi, S.; Nakamura, K.G. J. Appl. Phys.  2012, 111, 053526-1-5.
    DOI: 10.1063/1.3692080
  • Coordination and Electronic Structure of Ruthenium(II) -tris-2,2’- bipyridine in the Triplet Metal-to-Ligand Charge-Transfer Excited State Observed by Picosecond Time-Resolved Ru K-Edge XAFS
    Sato, T.; Nozawa, S.; Tomita, A.; Hoshino, M.; Koshihara, S.; Fujii, H.; Adachi, S. J. Phys. Chem.  C  2012, 116, 14232-14236.
    DOI: 10.1021/jp3038285
  • Visualizing Breathing Motion of Internal Cavities in Concert with Ligand Migration in Myoglobin
    Tomita, A.; Sato, T.; Ichiyanagi, K.; Nozawa, S.; Ichikawa, H.; Chollet, M.; Kawai, F.; Park, S.-Y.; Tsuduki, T.; Yamato, T.; Koshihara, S.; Adachi, S. Proc. Nat. Acad. Sci. USA, 2009, 106, 2612-2616.
    DOI: 10.1073/pnas.0807774106

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Contact
ayana.sato[at]jichi.ac.jp