Photoinduced anisotropic distortion as the electron trapping site of tungsten trioxide by ultrafast W L 1 -edge X-ray absorption spectroscopy with full potential multiple scattering calculations - Archive ouverte HAL Access content directly
Journal Articles Physical Chemistry Chemical Physics Year : 2020

Photoinduced anisotropic distortion as the electron trapping site of tungsten trioxide by ultrafast W L 1 -edge X-ray absorption spectroscopy with full potential multiple scattering calculations

Bunsho Ohtani
Yasuhiro Niwa
  • Function : Author
KEK
Shunsuke Nozawa
  • Function : Author
  • PersonId : 948600
KEK
Kohei Ichiyanagi
  • Function : Author
KEK
Ryo Fukaya
  • Function : Author
KEK
Shin-Ichi Adachi
  • Function : Author
KEK
Keisuke Hatada
Toshihiko Yokoyama
  • Function : Correspondent author
Kiyotaka Asakura
  • Function : Correspondent author

Abstract

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.
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Dates and versions

hal-02280133 , version 1 (09-09-2019)

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Akihiro Koide, Yohei Uemura, Daiki Kido, Yuki Wakisaka, Satoru Takakusagi, et al.. Photoinduced anisotropic distortion as the electron trapping site of tungsten trioxide by ultrafast W L 1 -edge X-ray absorption spectroscopy with full potential multiple scattering calculations. Physical Chemistry Chemical Physics, 2020, 22 (5), pp.2615-2621. ⟨10.1039/C9CP01332F⟩. ⟨hal-02280133⟩
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