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arXiv 2407.05964physics.opticscond-mat.mtrl-sci
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利用激光驱动源在水窗波段实现超快能量色散软X射线衍射

Ultrafast energy-dispersive soft-x-ray diffraction in the water window with a laser-driven source

Jasmin Jarecki, Martin Hennecke, Themistoklis Sidiropoulos, Matthias Schnuerer, Stefan Eisebitt, Daniel Schick

AI总结:

针对实验室高次谐波光源光子通量低、单色衍射方案受限的问题,提出覆盖200-600eV水窗的飞秒能量色散软X射线衍射方案,并通过Mo/Si超晶格实验验证了其探测超快结构动力学的能力。

摘要:

时间分辨软X射线衍射实验通过探测有序现象的超快动力学过程,可揭示各类固态材料中的微观过程。尽管基于实验室的高次谐波产生(HHG)光源能提供所需的光子能量,但其有限的光子通量分布在很宽的光谱范围内,使得传统的单色衍射方案颇具挑战。本文提出一种具备飞秒时间分辨率、光子能量覆盖200至600 eV水窗波段的能量色散软X射线衍射方案。该实验利用HHG发射的宽带特性,高效探测倒易空间中的大尺度区域。作为概念验证,我们在一项超快非共振软X射线衍射实验中研究了Mo/Si超晶格的激光诱导结构动力学。通过软X射线散射模拟,我们从约500 eV光子能量下倒易空间中其一阶超晶格布拉格峰的测量位移中,提取出了 underlying 的应变动力学过程。

英文摘要:

Time-resolved soft-x-ray-diffraction experiments give access to microscopic processes in a broad range of solid-state materials by probing ultrafast dynamics of ordering phenomena. While laboratory-based high-harmonic generation (HHG) light sources provide the required photon energies, their limited photon flux is distributed over a wide spectral range, rendering typical monochromatic diffraction schemes challenging. Here, we present a scheme for energy-dispersive soft-x-ray diffraction with femtosecond temporal resolution and photon energies across the water window from 200 to 600 eV. The experiment utilizes the broadband nature of the HHG emission to efficiently probe large slices in reciprocal space. As a proof-of-concept, we study the laser-induced structural dynamics of a Mo/Si superlattice in an ultrafast, non-resonant soft-x-ray diffraction experiment. We extract the underlying strain dynamics from the measured shift of its first order superlattice Bragg peak in reciprocal space at photon energies around 500 eV via soft-x-ray scattering simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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