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在5.9 keV的种子刺激的X射线发射

Margaret D Doyle¹, Aliaksei Halavanau², Yu Zhang³

¹Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

|January 19, 2024

概括

使用X射线自由电子激光器 (XFELs) 实现的种子刺激发射 (SSE) 强度明显低于放大自发发射 (ASE). 这一突破使得X射线连贯性和光谱学的新应用成为可能.

科学领域:

原子和分子物理原子和分子物理
激光物理激光物理
材料科学材料科学材料科学

背景情况:

射线自由电子激光器 (XFEL) 能够研究刺激的X射线辐射.
两个主要方案,放大自发发射 (ASE) 和种子刺激发射 (SSE),正在探索连贯的X射线生成.
SSE使用二次XFEL脉冲来启动刺激发射.

研究的目的:

为了研究和比较放大自发发射 (ASE) 和种子刺激发射 (SSE) 的Mn Kα1光线.
为了确定ASE和SSE的脉冲强度值.
评估SSE的可行性,用于产生连贯的X射线源和光谱应用.

主要方法:

使用7 femt秒的FWHM XFEL脉冲在6.6 keV以出3.9摩拉的NaMnO4溶液.
测量了 5.9 keV Mn Kα1 的光线.
改变脉冲强度以观察和量化ASE和SSE现象.

主要成果:

放大自发发射 (ASE) 在脉冲强度为1.7 × 10^19 W/cm^2.2时观察到.
在显著降低的脉冲强度下观察到种子刺激发射 (SSE),降至1.1 × 10^17 W/cm^2.
观察到的SSE强度与现有的XFEL设施兼容.

结论:

种子激发发射 (SSE) 在目前XFEL仪器可以获得的强度下是实验性可行的.
SSE为产生连贯的X射线脉冲提供了一个有前途的途径.
SSE可以应用于过渡金属复合物的光谱研究和其他先进的应用.

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