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@ARTICLE{Uemura:631513,
author = {Uemura, Yohei and Yamamoto, Kohei and Niwa, Yasuhiro and
Buttiens, Thomas and Elnaggar, Hebatalla and Wang, Ru-pan
and Lazemi, Masoud and de Groot, Frank and Katayama, Tetsuo
and Yabashi, Makina and Milne, Christopher J. and Yokoyama,
Toshihiko},
title = {{E}lectronic and {S}tructural {R}elaxation of
{P}hotoexcited {WO}$_3$ {O}bserved by {F}emtosecond
{R}esonant {X}-ray {E}mission {S}pectra},
journal = {The journal of physical chemistry letters},
volume = {16},
number = {24},
issn = {1948-7185},
address = {Washington, DC},
publisher = {ACS},
reportid = {PUBDB-2025-02025},
pages = {6138 - 6145},
year = {2025},
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.},
cin = {$XFEL_E1_FXE$ / FS-FLASH},
ddc = {530},
cid = {$I:(DE-H253)XFEL_E1_FXE-20210408$ /
I:(DE-H253)FS-FLASH-20140814},
pnm = {631 - Matter – Dynamics, Mechanisms and Control
(POF4-631) / 6G13 - Accelerator of European XFEL
(POF4-6G13)},
pid = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G13},
experiment = {EXP:(DE-H253)XFEL-Exp-20150101},
typ = {PUB:(DE-HGF)16},
doi = {10.1021/acs.jpclett.5c01062},
url = {https://bib-pubdb1.desy.de/record/631513},
}