ヘリウム滴におけるイオン溶解の第一段階の観察
Simon H Albrechtsen1, Constant A Schouder2,3, Alberto Viñas Muñoz2
1Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark.
Nature
|November 8, 2023
まとめ
原子レベルでの解の過程を リアルタイムで観察したのは初めてです 彼らは液体ヘリウム中のナトリウムイオンにヘリウム原子の結合率を測定し,溶解のダイナミクスに関する重要な洞察を明らかにしました.
科学分野:
- 物理化学
- 原子物理学
- 凝縮物質物理学
背景:
- 熱力学と運動学を通してマクロスコープ的に理解される.
- 原子レベルでの溶解は,溶媒分子/原子が溶解イオン/分子に惹かれることを含む.
- これらの主要な解決ステップをリアルタイムで観察することは大きな課題でした.
研究 の 目的:
- 原子解のリアルタイムダイナミクスを観察し,定量化します.
- ピコ秒の時間スケールでイオンに溶媒原子の結合過程を調査する.
- 実験データとイオン溶解の理論モデルを比較する.
主な方法:
- 液体ヘリウムナノドロップレットの表面で単一のナトリウムイオンを生成する.
- 連続した溶媒原子がイオンに付着する時間を測定する.
- 液体ヘリウムナノドロップルをイオン溶解研究のためのユニークな溶媒環境として利用する.
主要な成果:
- 最初の5つのヘリウム原子とナトリウムイオンの結合ダイナミクスはポイソンのプロセスに従った.
- 最初の溶解段階ではピコ秒あたり2.0ヘリウム原子の結合率が決定された.
- 溶解エネルギーの約半分が 4 ピコ秒で消えた.
結論:
- この研究は,原子レベルの解のダイナミクスの最初のリアルタイム観測を提供します.
- 実験結果は時間依存密度関数理論のシミュレーションと一致しています
- 開発された方法は,理論的な溶解モデルを比較し,カチオン分子複合体の形成を研究することを容易にする.
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