The dynamics beamline at SSRF
作者机构：Chinese Acad Sci Shanghai Adv Res Inst Shanghai 201204 Peoples R China ShanghaiTech Univ Shanghai 201210 Peoples R China
出 版 物：《NUCLEAR SCIENCE AND TECHNIQUES》 (核技术（英文）)
年 卷 期：2024年第35卷第9期
页 面：1-12页
核心收录：
学科分类：070207[理学-光学] 07[理学] 08[工学] 0827[工学-核科学与技术] 0803[工学-光学工程] 0702[理学-物理学]
基 金：SSRF Phase-II Beamline Project
主 题：ED-XAS SR-IR Time-resolved D-line SSRF SYNCHROTRON-RADIATION DISPERSIVE MODE SPECTROSCOPY PRESSURE EXAFS SPECTROMETER DICHROISM DETECTOR XAFS IR
摘 要：The dynamics beamline (D-Line), which combines synchrotron radiation infrared spectroscopy (SR-IR) and energy-dispersive X-ray absorption spectroscopy (ED-XAS), is the first beamline in the world to realize concurrent ED-XAS and SR-IR measurements at the same sample position on a millisecond time-resolved scale. This combined technique is effective for investigating rapid structural changes in atoms, electrons, and molecules in complicated disorder systems, such as those used in physics, chemistry, materials science, and extreme conditions. Moreover, ED-XAS and SR-IR can be used independently in the two branches of the D-Line. The ED-XAS branch is the first ED-XAS beamline in China, which uses a tapered undulator light source and can achieve approximately 2.5 x 1012 photons/s300 eV BW@7.2 keV at the sample position. An exchangeable polychromator operating in the Bragg-reflection or Laue-transmission configuration is used in different energy ranges to satisfy the requirements for beam size and energy resolution. The focused beam size is approximately 3.5 mu m (H) x 21.5 mu m (V), and the X-ray energy range is 5-25 keV. Using one- and two-dimensional position-sensitive detectors with frame rates of up to 400 kHz enables time resolutions of tens of microseconds to be realized. Several distinctive techniques, such as the concurrent measurement of in situ ED-XAS and infrared spectroscopy, time-resolved ED-XAS, high-pressure ED-XAS, XMCD, and pump-probe ED-XAS, can be applied to achieve different scientific goals.
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