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Direct observation of the electronic states of photoexcited hematite with ultrafast 2p3d X-ray absorption spectroscopy and resonant inelastic X-ray scattering.
Ismail, Ahmed S M; Uemura, Yohei; Park, Sang Han; Kwon, Soonnam; Kim, Minseok; Elnaggar, Hebatalla; Frati, Federica; Niwa, Yasuhiro; Wadati, Hiroki; Hirata, Yasuyuki; Zhang, Yujun; Yamagami, Kohei; Yamamoto, Susumu; Matsuda, Iwao; Halisdemir, Ufuk; Koster, Gertjan; Weckhuysen, Bert M; de Groot, Frank M F.
Afiliação
  • Ismail ASM; Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitslaan 99, 3584 CG Utrecht, The Netherlands. f.m.f.degroot@uu.nl.
  • Uemura Y; Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitslaan 99, 3584 CG Utrecht, The Netherlands. f.m.f.degroot@uu.nl and Institute for Catalysis, Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo, Hokkaido 001-0021, Japan.
  • Park SH; PAL-XFEL, Pohang Accelerator Laboratory, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, South Korea.
  • Kwon S; PAL-XFEL, Pohang Accelerator Laboratory, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, South Korea.
  • Kim M; PAL-XFEL, Pohang Accelerator Laboratory, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, South Korea.
  • Elnaggar H; Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitslaan 99, 3584 CG Utrecht, The Netherlands. f.m.f.degroot@uu.nl.
  • Frati F; Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitslaan 99, 3584 CG Utrecht, The Netherlands. f.m.f.degroot@uu.nl.
  • Niwa Y; Photon Factory, Institute for Materials Structure Science, KEK, Tsukuba 305-0801, Japan.
  • Wadati H; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan and Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan.
  • Hirata Y; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Zhang Y; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Yamagami K; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Yamamoto S; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Matsuda I; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Halisdemir U; Faculty of Science and Technology and MESA + Institute for Nanotechnology, University of Twente, P.O. Box 2171, 7500 AE Enschede, The Netherlands.
  • Koster G; Faculty of Science and Technology and MESA + Institute for Nanotechnology, University of Twente, P.O. Box 2171, 7500 AE Enschede, The Netherlands.
  • Weckhuysen BM; Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitslaan 99, 3584 CG Utrecht, The Netherlands. f.m.f.degroot@uu.nl.
  • de Groot FMF; Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitslaan 99, 3584 CG Utrecht, The Netherlands. f.m.f.degroot@uu.nl.
Phys Chem Chem Phys ; 22(5): 2685-2692, 2020 Feb 07.
Article em En | MEDLINE | ID: mdl-31641716
ABSTRACT
Hematite, α-Fe2O3, is an important semiconductor for photoelectrochemical water splitting. Its low charge carrier mobility and the presence of midgap states provide favourable conditions for electron-hole recombination, hence affecting the semiconductor's photoelectrochemical efficiency. The nature of the excited state and charge carrier transport in hematite is strongly debated. In order to further understand the fundamental properties of the hematite photoexcited state, we conducted femtosecond 2p (L3) X-ray absorption (XAS) and 2p3d resonant inelastic scattering (RIXS) measurements on hematite thin-films at the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL). The observed spectral changes and kinetic processes are in agreement with previous 3p XAS reports. The potential additional information that could be acquired from 2p3d RIXS experiments is also discussed.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Holanda

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Holanda