Yohei Uemura, Kohei Yamamoto, Yasuhiro Niwa, Thomas Buttiens, Hebatalla Elnaggar, Ru-Pan Wang, Masoud Lazemi, Frank de Groot, Tetsuo Katayama, Makina Yabashi, Christopher J Milne, Toshihiko Yokoyama
{"title":"Electronic and Structural Relaxation of Photoexcited WO<sub>3</sub> Observed by Femtosecond Resonant X-ray Emission Spectra.","authors":"Yohei Uemura, Kohei Yamamoto, Yasuhiro Niwa, Thomas Buttiens, Hebatalla Elnaggar, Ru-Pan Wang, Masoud Lazemi, Frank de Groot, Tetsuo Katayama, Makina Yabashi, Christopher J Milne, Toshihiko Yokoyama","doi":"10.1021/acs.jpclett.5c01062","DOIUrl":null,"url":null,"abstract":"<p><p>Photoexcited states of tungsten trioxide (WO<sub>3</sub>) 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<sub>3</sub> edge XAS shifts to lower energy and the energy levels of the <i>t</i><sub>2g</sub> and <i>e</i><sub>g</sub> 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 <i>t</i><sub>2g</sub> and <i>e</i><sub>g</sub> 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<sub>3</sub>. This work demonstrates that the detailed dynamics of 5d elements in the femtosecond range can be addressed with HERFD-XAS/RXES.</p>","PeriodicalId":62,"journal":{"name":"The Journal of Physical Chemistry Letters","volume":" ","pages":"6138-6145"},"PeriodicalIF":4.8000,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry Letters","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.jpclett.5c01062","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/6/10 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Photoexcited states of tungsten trioxide (WO3) 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 L3 edge XAS shifts to lower energy and the energy levels of the t2g and eg 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 t2g and eg 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 WO3. This work demonstrates that the detailed dynamics of 5d elements in the femtosecond range can be addressed with HERFD-XAS/RXES.
期刊介绍：
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
