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| ファイル | 記述 | サイズ | フォーマット | |
|---|---|---|---|---|
| 1.4989862.pdf | 1.94 MB | Adobe PDF | 見る/開く |
| タイトル: | Femtosecond time-resolved X-ray absorption spectroscopy of anatase TiO2 nanoparticles using XFEL |
| 著者: | Obara, Yuki Ito, Hironori Ito, Terumasa Kurahashi, Naoya Thürmer, Stephan Tanaka, Hiroki Katayama, Tetsuo Togashi, Tadashi Owada, Shigeki Yamamoto, Yo-ichi Karashima, Shutaro Nishitani, Junichi  Yabashi, Makina Suzuki, Toshinori  Misawa, Kazuhiko |
| 著者名の別形: | 片山, 哲夫 矢橋, 牧名 鈴木, 俊法 三沢, 和彦 |
| 発行日: | Jul-2017 |
| 出版者: | American Institute of Physics |
| 誌名: | Structural Dynamics |
| 巻: | 4 |
| 号: | 4 |
| 論文番号: | 044033 |
| 抄録: | The charge-carrier dynamics of anatase TiO2 nanoparticles in an aqueous solution were studied by femtosecond time-resolved X-ray absorption spectroscopy using an X-ray free electron laser in combination with a synchronized ultraviolet femtosecond laser (268 nm). Using an arrival time monitor for the X-ray pulses, we obtained a temporal resolution of 170 fs. The transient X-ray absorption spectra revealed an ultrafast Ti K-edge shift and a subsequent growth of a pre-edge structure. The edge shift occurred in ca. 100 fs and is ascribed to reduction of Ti by localization of generated conduction band electrons into shallow traps of self-trapped polarons or deep traps at penta-coordinate Ti sites. Growth of the pre-edge feature and reduction of the above-edge peak intensity occur with similar time constants of 300–400 fs, which we assign to the structural distortion dynamics near the surface. |
| 記述: | 光触媒ナノ粒子における光照射後10兆分の1秒での電子の動きをX線自由電子レーザーで観測. 京都大学プレスリリース. 2017-07-06. |
| 著作権等: | © Author(s) 2017. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
| URI: | http://hdl.handle.net/2433/226331 |
| DOI(出版社版): | 10.1063/1.4989862 |
| PubMed ID: | 28713842 |
| 関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2017-07-06 |
| 出現コレクション: | 学術雑誌掲載論文等 |
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