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一个模块化的桌面设置,用于超快的X射线衍射

W Lu, M Nicoul, U Shymanovich

The Review of scientific instruments

|January 8, 2024

概括

一个新的桌面设置使得使用激光驱动的等离子X射线源的femtosecond时间分辨率X射线衍射. 这种可访问的系统实现了研究材料动态的高精度.

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
射线科学X射线科学X射线科学

背景情况:

五秒时间解析的X射线衍射 (TRXRD) 对于研究超快的材料动力学至关重要.
现有的TRXRD设置可能很复杂,缺乏可访问性.
开发紧的,用户友好的TRXRD系统对于更广泛的研究应用是必不可少的.

研究的目的:

介绍一个新的桌面设置为femtosecond时间解析的X射线衍射.
为了展示TRXRD实验的模块化和可访问的设计.
为了展示系统在低重复率下进行高精度测量的能力.

主要方法:

使用一个Cu Kα (8.05 keV) 激光驱动的等离子体X射线源.
实施了一个前脉冲方案以优化Kα-收益率.
采用放大式多层X射线镜 (蒙特尔-赫利奥斯几何) 来收集辐射.
使用气体电离室探测器进行衍射信号正常化.
在激光激发的表层Bi膜上进行了时间分辨率衍射实验.

主要成果:

在10 Hz的重复速率下实现了>10 ^ 5 Cu Kα光子/脉冲的准聚合流.
证明了测量相对信号变化<1%的能力.
在表层Bi膜上成功执行了时间分辨率衍射.
在多晶样品上验证了Debye-Scherrer测量的设置.

结论:

开发的桌面设置为 femtosecond 时间分辨率的X射线衍射提供了一个可访问和高效的平台.
模块化设计提高了可用性和组件可访问性.
该系统适用于研究各种材料的超快动态,包括薄膜和多晶样品.

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