2024-09-20 インペリアル・カレッジ・ロンドン(ICL)
＜関連情報＞
- https://www.imperial.ac.uk/news/256393/ultrafast-probing-ai-enabled-drug-discovery-news/
- https://opg.optica.org/optica/fulltext.cfm?uri=optica-11-9-1320&id=559866
調整可能なDUV-Visポンプパルスを用いた数フェムト秒軟X線過渡吸収分光法 Few-femtosecond soft X-ray transient absorption spectroscopy with tuneable DUV-Vis pump pulses
Jacob P. Lee, Timur Avni, Oliver Alexander, Marios Maimaris, Haoqing Ning, Artem A. Bakulin, Philippe G. Burden, Evangelos Moutoulas, Dimitra G. Georgiadou, Christian Brahms, John C. Travers, Jon P. Marangos, and Clément Ferchaud
Optica Published: September 16, 2024
DOI:https://doi.org/10.1364/OPTICA.530964
Abstract
Achieving few-femtosecond resolution for a pump-probe experiment is crucial to measuring the fastest electron dynamics and for creating superpositions of valence states in quantum systems. However, traditional UV-Vis pump pulses cannot achieve few-fs durations and usually operate at fixed wavelengths. Here, we present, to our knowledge, an unprecedented temporal resolution and pump tuneability for UV-Vis-pumped soft X-ray transient absorption spectroscopy. We have combined few-fs deep-UV to visible tuneable pump pulses from resonant dispersive wave emission in hollow capillary fiber with attosecond soft X-ray probe pulses from high harmonic generation. We achieve sub-5-fs time resolution, sub-fs interferometric stability, and continuous tuneability of the pump pulses from 230 to 700 nm. We demonstrate that the pump can initiate an ultrafast photochemical reaction and that the dynamics at different atomic sites can be resolved simultaneously. These capabilities will allow studies of the fastest electronic dynamics in a large range of photochemical, photobiological and photovoltaic reactions.
