Direct observation of phase transition dynamics of water with ultrafast time-resolved electron diffraction

• Project/Area Number: 17K17893
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I; Biological physics/Chemical physics/Soft matter physics
• Research Institution: Okayama University
• Principal Investigator: Hada Masaki 岡山大学, 自然科学研究科, 助教 (70636365)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 構造ダイナミクス / 超高速現象 / 計測技術 / 水の構造 / 光物性

Outline of Final Research Achievements

we developed a system to deposit H2O molecules onto ultrathin silicon nitride substrates in time-resolved electron diffraction apparatus to apply ultrafast time-resolved electron diffraction measurements for amorphous H2O molecules. The subtracted electron diffraction patterns before and after the ultraviolet photoexcitation represent O-H bond dissociation via multiphoton absorption and charge transfer, which trigger ionization and intermolecular disorder in the amorphous H2O. The results obtained in the experiments illustrate light-matter and matter-matter interactions in amorphous H2O molecules.

Academic Significance and Societal Importance of the Research Achievements

「水」は、物質の中でも最も身近であり、軽元素から成り立ち、その分子運動が極めて速いため、最もその構造ダイナミクスを観測することが困難であると考えられている。申請者は、「水」の光照射下での構造ダイナミクスを観測・解析する装置・技術を開発し、これまで計算的手法でしか明らかにされてこなかった水の紫外線照射下における分子運動を観測することに成功した。本研究成果は、米国化学会より発行されている学術誌（Journal of Physical Chemistry A 122, 9579 (2018).）に掲載された。

Research Products

• [Journal Article] Ultrafast Time-resolved Electron Diffraction Applying for Amorphous H₂O Molecules (2019)
  • Author(s): HADA Masaki
  • Journal Title: Nihon Kessho Gakkaishi Volume: 61 Issue: 1 Pages: 23-28
  • DOI: 10.5940/jcrsj.61.23
  • NAID: 130007605716
  • ISSN: 0369-4585, 1884-5576
  • Year and Date: 2019-02-28
  • Peer Reviewed / Open Access
• [Journal Article] Bond Dissociation Triggering Molecular Disorder in Amorphous H2O (2018)
  • Author(s): Hada Masaki、Shigeeda Yuho、Koshihara Shin-ya、Nishikawa Takeshi、Yamashita Yoshifumi、Hayashi Yasuhiko
  • Journal Title: The Journal of Physical Chemistry A Volume: 122 Issue: 49 Pages: 9579-9584
  • DOI: 10.1021/acs.jpca.8b08455
  • Peer Reviewed
• [Journal Article] Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals (2018)
  • Author(s): M. Hada, S. Saito, Y. Hayashi, K. Miyata, Y. Shigeta, K. Onda
  • Journal Title: Journal of Visualized Experiments Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Structural Monitoring of the Onset of Excited-State Aromaticity in a Liquid Crystal Phase (2017)
  • Author(s): Hada Masaki、Saito Shohei、Tanaka Sei’ichi、Sato Ryuma、Yoshimura Masahiko、Mouri Kazuhiro、Matsuo Kyohei、Yamaguchi Shigehiro、Hara Mitsuo、Hayashi Yasuhiko、R?hricht Fynn、Herges Rainer、Shigeta Yasuteru、Onda Ken、Miller R. J. Dwayne
  • Journal Title: Journal of the American Chemical Society Volume: 139 Issue: 44 Pages: 15792-15800
  • DOI: 10.1021/jacs.7b08021
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 紫外光励起による解氷の構造ダイナミクス (2018)
  • Author(s): 羽田 真毅、重枝 勇歩、林 靖彦、腰原 伸也
  • Organizer: 第79回応用物理学会秋季学術講演会
• [Presentation] 時間分解電子線回折法を用いたソフトマテリアルの構造ダイナミクス (2018)
  • Author(s): 羽田真毅
  • Organizer: 埋もれた界面のX線・中性子解析ワークショップ2018（招待講演）
  • Invited
• [Presentation] Structural dynamics evidencing plasmon-induced reduction in Graphene Oxide (2018)
  • Author(s): M. Hada, I. Katayama, K. Ichiyanagi, W. Chen, S. Mizote, T. Sawa, T. Suzuki, T. Nishikawa, Y. Yamashita, T. Yokoya, T. Seki, J. Matsuo, T. Tokunaga, R. Fukaya, S. Nozawa, Y. Minami, Y. Arashida, K. Tsuruta, S. Koshihara, Y. Hayashi, S. Adachi, J. Takeda, Y. Nishina,
  • Organizer: Gordon Research Conference "Ultrafast Phenomena in Cooperative Systems"
  • Int'l Joint Research
• [Presentation] Molecular dynamics of photofunctionalized liquid crystals (2017)
  • Author(s): Masaki Hada
  • Organizer: Photoinduced Phase Transitions 6 (PIPT6)
  • Int'l Joint Research / Invited
• [Presentation] Photoinduced Oxygen Transportation in EuBaCo2O5.38 (2017)
  • Author(s): Masaki Hada, Naoya Keio, Yasuhiko Hayashi, Toru Asaka, Taka-hisa Arima, Yoichi Okimoto, Shinya Koshihara
  • Organizer: ISAMR 2017, International Symposium for Advanced Materials Research
  • Int'l Joint Research / Invited
• [Presentation] 時間分解電子線回折法の液晶分子ダイナミクスへの展開 (2017)
  • Author(s): 羽田真毅
  • Organizer: 物性研短期研究会「光で 見る・操る 電子物性科学の最前線～強相関, トポロジー, 低次元, ダイナミクス～」
  • Invited
• [Presentation] 時間分解電子線回折法を用いたEuBaCo2O5.38の構造ダイナミクス計測 (2017)
  • Author(s): 羽田真毅, 慶尾直哉, 村上寛虎, 西川亘, 山下善文, 林靖彦, 横谷尚睦, 松尾二郎, 浅香透, 鈴木達也, 阿部伸行, 有馬孝尚, 沖本洋一, 腰原伸也
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] Ultrafast Structural Dynamics with Femtosecond Electron Diffraction (2017)
  • Author(s): Masaki Hada
  • Organizer: OptoXNano
  • Int'l Joint Research / Invited
• [Presentation] 超高速電子線回折法を用いて探索するコバルト酸化物の光誘起酸素移動 (2017)
  • Author(s): 羽田 真毅、慶尾 直哉、西川 亘、山下 義文、林 靖彦、横谷 尚睦、松尾 二郎、浅香 透、鈴木 達也、阿部 伸行、有馬 孝尚、小沢 陽、沖本 洋一、腰原 伸也
  • Organizer: 第27回日本MRS年次学会（招待講演）
  • Invited