High-energy-resolution off-resonant spectroscopy with self-seeded x-ray free-electron laser pulses.

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Structural Dynamics-Us Pub Date : 2024-03-26 eCollection Date: 2024-03-01 DOI:10.1063/4.0000243

Jang Hyeob Sohn, Gyeongbo Kang, Tae-Kyu Choi, Gyusang Lee, Changhoo Lee, Sae Hwan Chun, Jaeku Park, Dongbin Shin, Byoung-Ick Cho

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Abstract

This paper presents the implementation of high-energy-resolution off-resonant spectroscopy (HEROS) measurements using self-seeded x-ray free-electron laser (XFEL) pulses. This study systematically investigated XFEL conditions, including photon energy and accumulated shot numbers, to optimize the measurement efficiency for copper foil samples near the K-edge. The x-ray absorption spectra reconstructed using HEROS were compared with those derived from fluorescence-yield measurements. The HEROS-based spectra exhibited consistent line shapes independent of the sample thickness. The potential application of HEROS to high-temperature copper was also explored. HEROS offers distinct advantages including scan-free measurement of x-ray absorption spectra with reduced core-hole lifetime broadening and self-absorption effects. Using self-seeded XFEL pulses, HEROS facilitates single-shot-based pump-probe measurements to investigate the ultrafast dynamics in various materials and diverse conditions.

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利用自种子 X 射线自由电子激光脉冲进行高能分辨率非共振光谱分析。

本文介绍了利用自播散 X 射线自由电子激光（XFEL）脉冲实施高能分辨率非共振光谱（HEROS）测量的情况。这项研究系统地研究了 XFEL 的条件，包括光子能量和累积发射数，以优化 K 边附近铜箔样品的测量效率。使用 HEROS 重建的 X 射线吸收光谱与荧光产率测量得出的光谱进行了比较。基于 HEROS 的光谱显示出一致的线形，与样品厚度无关。此外，还探讨了 HEROS 在高温铜方面的潜在应用。HEROS 具有明显的优势，包括免扫描测量 X 射线吸收光谱，减少了芯孔寿命展宽和自吸收效应。利用自seed XFEL 脉冲，HEROS 可进行基于泵探头的单次测量，以研究各种材料和各种条件下的超快动力学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.

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