Choi Tae Kyu, Park Jaeku, Kim Gyujin, Jang Hoyoung, Park Sang Youn, Sohn Jang Hyeob, Cho Byoung Ick, Kim Hyunjung, Kim Kyung Sook, Nam Inhyuk, Chun Sae Hwan
XFEL Division, Pohang Accelerator Laboratory, POSTECH, Pohang, Gyeongbuk 37673, Republic of Korea.
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
J Synchrotron Radiat. 2023 Nov 1;30(Pt 6):1038-1047. doi: 10.1107/S1600577523007312. Epub 2023 Sep 22.
Self-seeded hard X-ray pulses at PAL-XFEL were used to commission a resonant X-ray emission spectroscopy experiment with a von Hamos spectrometer. The self-seeded beam, generated through forward Bragg diffraction of the [202] peak in a 100 µm-thick diamond crystal, exhibited an average bandwidth of 0.54 eV at 11.223 keV. A coordinated scanning scheme of electron bunch energy, diamond crystal angle and silicon monochromator allowed us to map the Ir Lβ X-ray emission lines of IrO powder across the Ir L-absorption edge, from 11.212 to 11.242 keV with an energy step of 0.3 eV. This work provides a reference for hard X-ray emission spectroscopy experiments utilizing self-seeded pulses with a narrow bandwidth, eventually applicable for pump-probe studies in solid-state and diluted systems.
利用PAL-XFEL的自种子硬X射线脉冲对冯哈莫斯光谱仪进行共振X射线发射光谱实验调试。通过在100微米厚的金刚石晶体中对[202]峰进行前向布拉格衍射产生的自种子光束，在11.223千电子伏特时平均带宽为0.54电子伏特。电子束能量、金刚石晶体角度和硅单色仪的协同扫描方案使我们能够绘制出IrO粉末的Ir Lβ X射线发射线在Ir L吸收边的图谱，范围从11.212到11.242千电子伏特，能量步长为0.3电子伏特。这项工作为利用窄带宽自种子脉冲的硬X射线发射光谱实验提供了参考，最终可应用于固态和稀释系统中的泵浦-探测研究。
