在激光激发的黄金中,使用硬X射线自由电子激光器的X射线衍射进行声子硬化的证据

Adrien Descamps^1,2,3, Benjamin K Ofori-Okai^1,4, Oliviero Bistoni^5,6

¹SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.

Science advances

|February 9, 2024

概括

高激光强度可以改变黄金.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
超快激光科学超快激光科学

背景情况:

在 femt秒时间尺度上的激光物质相互作用可以扰乱原子间电位.
在高激光强度下,黄金的Phonon硬化已经被假定,但在高能量密度下未经实验证实.

研究的目的:

在更高的能量密度下,为黄金中的声子硬化提供实验证据.
为了研究高激光强度对黄金原子间潜力的影响.

主要方法:

使用现场一次射击X射线衍射 (XRD).
采用了硬X射线自由电子激光器 (XFEL).
在更高的吸收能量密度下检查了激光激发黄金 (Au).

主要成果:

观察到激光激发黄金衍射线强度演变的变化.
数据提供了直接的证据,支持音声硬化现象.

结论:

在更高的能量密度下证实了黄金中的波硬化.
这项研究澄清了先前低能量密度实验的模两可的解释.

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