Metastable structure of photoexcited WO₃ determined by the pump--probe extended X-ray absorption fine structure spectroscopy and constrained thorough search analysis

2022/05/14 by Daiki Kido, Kido, Daiki, Hiromitsu Uehara +28
Engineering · Physics and Astronomy · #Atomic and Molecular Physics #FOS: Physical sciences #Laser-Matter Interactions and Applications #Laser-induced spectroscopy and plasma #Materials Science (cond-mat.mtrl-sci)

paper · pdf · doi:10.48550/arxiv.2205.07145

openalex publication_date 2022/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We have determined the local structure of photoexcited metastable WO₃ created 150 ps after 400 nm laser irradiation by the pulse pump--probe L₃-edge extended X-ray absorption fine structure spectroscopy and the constrained thorough search analysis. We have found a highly distorted octahedral local structure with one of the shortest W=O bonds being further shortened to 1.66 Åwhile the other five bonds were elongated even though theoretical calculations predicted the reverse change. We discuss this contradiction and propose a possible structure for the metastable state.

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