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ビスムスの超高速結合軟化:X線で固体の原子間潜在力をマッピングする

D M Fritz¹, D A Reis, B Adams

¹Frontiers in Optical Coherent and Ultrafast Science (FOCUS) Center, Departments of Physics and Applied Physics Program, University of Michigan, Ann Arbor, MI 48109, USA. dmfritz@slac.stanford.edu

Science (New York, N.Y.)

|February 3, 2007

まとめ

激烈なレーザーパルスは,極端な条件下でビスムートにおける原子間力の変化を明らかにします. この研究では,レーザーで誘発された固体-固体相変異の際に潜在エネルギー表面のマッピングを行います.

科学分野:

凝縮物質物理学凝縮物質物理学
マテリアルサイエンス材料科学
超高速科学とは

背景:

激しいフェムト秒レーザーの刺激により,物質の独特で一時的な状態が生まれます.
高興奮密度は,固体における原子間力を大きく変化させる.

研究の目的:

ビスムスの载体密度に依存する原子間ポテンシャルをマッピングする.
固体から固体への相変化に近づくビスムスを調査する.

主な方法:

高輝度線形電子加速器ベースのX線源を用いたストロボスコーピテクニックを使用した.
フェムト秒解像度のためのパルス・バイ・パルス・タイミング再構築を採用しました.
原子間潜在エネルギー表面の定量的な特徴が得られた.

主要な成果:

ビスムートの原子間潜在力の詳細なマッピングが達成されました.
この研究は,高興奮密度下でのビスムスの行動に焦点を当てた.
この研究は,固体-固体相変化への移行を調査した.

結論:

フェムトセカンドレーザー刺激は,物質のアクセス不可能な状態を研究するための方法を提供します.
原子間潜在エネルギー表面の定量的な特徴づけは可能である.
高度に興奮した固体の原子間電位は,正確に決定することができます.

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