接近激光制造的等离子源的时间下限,用于桌面软X射线测量NEXAFS测量
Danika Nimlos1, Alejandro Arellano2, Scott Kevin Cushing1
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, 91125, United States.
概括
一个新的桌面激光制造等离子体 (LPP) 源使时间分辨率柔软X射线 (SXR) 吸收测量具有高时间分辨率. 这一进步对于研究分子和材料的快速动态至关重要.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 化学 化学 化学
背景情况:
- 时间分辨率的X射线吸收光谱对于理解分子和材料系统中的动态过程至关重要.
- 脉冲X射线的桌面源正在进步,使得研究更容易获得.
- 激光制造等离子体 (LPP) 源为高分辨率的X射线生成提供了潜力.
研究的目的:
- 描述一种用于软X射线 (SXR) 和近端X射线吸收细结构 (NEXAFS) 测量的新型桌面激光生成等离子体 (LPP) 源.
- 为了评估23 ps脉冲持续时间LPP源与较长脉冲持续时间源的性能.
- 为了证明使用紧源的高时间分辨率X射线吸收研究的可行性.
主要方法:
- 使用桌面LPP源,由23PS脉冲激光驱动.
- 执行软X射线 (SXR) 和近边缘X射线吸收细结构 (NEXAFS) 光谱.
- 描述源参数,包括亮度,分辨率和稳定性.
- 获得的Si3N4和TiO2薄膜的NEXAFS光谱.
主要成果:
- 23 psi的LPP源实现了用于X射线吸收测量的高时间分辨率.
- 与较长脉冲源相比,尽管SXR流量较低,但获得了高的信号噪声比 (100) 和分辨率 (E/ΔE=424).
- 测量采集时间缩短到2.5分钟.
- 鉴定了由于气体喷射喷嘴退化的源不稳定性,并指出了潜在的解决方案.
结论:
- 具有短脉冲持续时间的桌面LPP源对于时间解析的X射线吸收光谱学是可行的.
- 这项技术使得分子和材料动态的更高时间分辨率研究成为可能.
- 对于长期应用,建议进一步优化源设计,特别是喷嘴稳定性.
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