在X射线自由电子激光器上同时进行明暗场X射线显微镜
Leora E Dresselhaus-Marais1,2,3, Bernard Kozioziemski4, Theodor S Holstad5
1Department of Materials Science & Engineering, Stanford University, Stanford, CA, USA. leoradm@stanford.edu.
Scientific reports
|October 16, 2023
概括
这项研究将暗场X射线显微镜 (DFXM) 扩展到X射线自由电子激光器 (XFEL),实现散装材料的超快,高分辨率的结构特征. 这种新方法可以在100 fs的分辨率下探测网格动力学,克服了基于同步仪的技术的局限性.
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
- 射线显微镜X射线显微镜
背景情况:
- 固体材料的微观结构特征对于理解机械和物理性质至关重要.
- 现有的显微镜工具通常仅限于表面研究,无法捕捉散装材料的动态.
- 同步射线X射线衍射和暗场X射线显微镜 (DFXM) 提供nm分辨率,但受到长整合时间的限制.
研究的目的:
- 将DFXM的功能扩展到X射线自由电子激光器 (XFEL) 以进行超快速,高分辨率的结构分析.
- 开发一种多模式的超快速高分辨率X射线显微镜,用于探测散装材料动态.
- 为了证明XFEL DFXM在研究可逆和不可逆的网格动态方面的能力.
主要方法:
- 在X射线自由电子激光设施中实施DFXM.
- 开发一种新的设置,将DFXM与同时亮场显微镜相结合.
- 利用来自XFEL的高光子流量在femtosecond时间尺度上进行结构性表征.
主要成果:
- 实现了具有100 fs分辨率的结构特征,比基于同步仪的方法快得多.
- 在同一样本体积内同时探测密度变化和结构动态.
- 在两个XFEL成功测试了多模态显微镜,提供了关于格子动态的初始数据.
结论:
- 基于XFEL的DFXM克服了用于研究材料动态的同步仪技术的时间限制.
- 开发的多模态显微镜为散装材料分析提供了前所未有的时空分辨率.
- 这种技术为研究固体材料中的超快现象开辟了新的途径.
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