Journal Article

PUBDB-2025-02025

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Electronic and Structural Relaxation of Photoexcited WO$_3$ Observed by Femtosecond Resonant X-ray Emission Spectra

Uemura, Y. (Corresponding author)Extern*XFEL.EU* ; Yamamoto, K. ; Niwa, Y. ; Buttiens, T. ; Elnaggar, H. ; Wang, R.-p.XFEL.EU*DESY* ; Lazemi, M. ; de Groot, F.Extern* ; Katayama, T. ; Yabashi, M. ; Milne, C. J. ; Yokoyama, T.

2025
ACS Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpclett.5c01062  doi:10.3204/PUBDB-2025-02025

Abstract: Photoexcited states of tungsten trioxide (WO$_3$) were observed using femtosecond high-energy-resolution fluorescence detection X-ray Absorption Spectra (HERFD-XAS) and resonant X-ray emission spectra (RXES). In the initial state of the photoexcitation (∼100 fs), the W L$_3$ edge XAS shifts to lower energy and the energy levels of the t$_{2g}$ and e$_g$ peaks are modulated due to the photoexcited electrons in the conduction band. The electronic state of the photoexcited W atoms is modified by 500 fs. The crystal field splitting between the t$_{2g}$ and e$_g$ peaks shrinks by 500 fs, which indicates local structural changes around the W atoms due to the formation of polarons. HERFD-XAS and RXES provide more details about the early state of the photoexcited states of WO$_3$. This work demonstrates that the detailed dynamics of 5d elements in the femtosecond range can be addressed with HERFD-XAS/RXES.

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Contributing Institute(s):

1. FXE (XFEL_E1_FXE)
2. FS-FLASH (FS-FLASH)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G13 - Accelerator of European XFEL (POF4-6G13) (POF4-6G13)

Experiment(s):

1. Experiments at XFEL

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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