論文

招待有り 査読有り 国際誌
2020年2月7日

Photoinduced anisotropic distortion as the electron trapping site of tungsten trioxide by ultrafast W L1-edge X-ray absorption spectroscopy with full potential multiple scattering calculations.

Physical chemistry chemical physics : PCCP
  • Akihiro Koide
  • ,
  • Yohei Uemura
  • ,
  • Daiki Kido
  • ,
  • Yuki Wakisaka
  • ,
  • Satoru Takakusagi
  • ,
  • Bunsho Ohtani
  • ,
  • Yasuhiro Niwa
  • ,
  • Shunsuke Nozawa
  • ,
  • Kohei Ichiyanagi
  • ,
  • Ryo Fukaya
  • ,
  • Shin-Ichi Adachi
  • ,
  • Tetsuo Katayama
  • ,
  • Tadashi Togashi
  • ,
  • Shigeki Owada
  • ,
  • Makina Yabashi
  • ,
  • Yusaku Yamamoto
  • ,
  • Misaki Katayama
  • ,
  • Keisuke Hatada
  • ,
  • Toshihiko Yokoyama
  • ,
  • Kiyotaka Asakura

22
5
開始ページ
2615
終了ページ
2621
記述言語
英語
掲載種別
研究論文(大学,研究機関等紀要)
DOI
10.1039/c9cp01332f

Understanding the excited state of photocatalysts is significant to improve their activity for water splitting reaction. X-ray absorption fine structure (XAFS) spectroscopy in X-ray free electron lasers (XFEL) is a powerful method to address dynamic changes in electronic states and structures of photocatalysts in the excited state in ultrafast short time scales. The ultrafast atomic-scale local structural change in photoexcited WO3 was observed by W L1 edge XAFS spectroscopy using an XFEL. An anisotropic local distortion around the W atom could reproduce well the spectral features at a delay time of 100 ps after photoexcitation based on full potential multiple scattering calculations. The distortion involved the movement of W to shrink the shortest W-O bonds and elongate the longest one. The movement of the W atom could be explained by the filling of the dxy and dzx orbitals, which were originally located at the bottom of the conduction band with photoexcited electrons.

リンク情報
DOI
https://doi.org/10.1039/c9cp01332f
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/30989154

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