世界初、液体の水の原子フリーズ・フレームに成功(First-ever atomic freeze-frame of liquid water)

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実験物理学の新分野を切り開く発見 Findings open a whole new field of experimental physics

2024-02-15 アルゴンヌ国立研究所(ANL)

世界初、液体の水の原子フリーズ・フレームに成功(First-ever atomic freeze-frame of liquid water)
Artistic rendering of attosecond X-ray pulses freezing all nuclear motion in liquid water, including those of the lightest hydrogen atoms. This allows researchers to isolate structural properties indicative of ambient water in its ground electronic state. (Image by Stacy Huang.)

科学者たちは、液体水のサンプル内で、電子のエネルギッシュな動きを孤立させながら、その電子が周回しているはるかに大きな原子の運動を「停止」させるという、ストップモーション写真に似た実験を行いました。この成果は、科学誌『Science』に今日報告され、これまでX線では到達できなかったタイムスケールで分子の電子構造を新たな視点から明らかにしました。この新技術により、X線が物体や人体に与える放射線の影響を理解する上で重要な一歩が踏み出されました。

<関連情報>

液体水のアト秒ポンプ・アト秒プローブX線分光法 Attosecond-pump attosecond-probe x-ray spectroscopy of liquid water

SHUAI LI , LIXIN LU , SWARNENDU BHATTACHARYYA , CAROLYN PEARCE , […], AND LINDA YOUNG
Science  Published:15 Feb 2024
DOI:https://doi.org/10.1126/science.adn6059

Abstract

Attosecond-pump/attosecond-probe experiments have long been sought as the most straightforward method to observe electron dynamics in real time. Although numerous successes have been achieved with overlapped near infrared femtosecond and extreme ultraviolet attosecond pulses combined with theory, true attosecond-pump/attosecond-probe experiments have been limited. We used a synchronized attosecond x-ray pulse pair from an x-ray free electron laser to study the electronic response to valence ionization in liquid water via all x-ray attosecond transient absorption spectroscopy (AX-ATAS). Our analysis showed that the AX-ATAS response is confined to the subfemtosecond timescale, eliminating any hydrogen atom motion and demonstrating experimentally that the 1b1 splitting in the x-ray emission spectrum is related to dynamics and is not evidence for two structural motifs in ambient liquid water.

1700応用理学一般
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