Singh Param Jeet, Maitra Tamaghna, Das A K, Yadav A K, Kumar Ravi, Agarwal Ankur, Dvivedi Ashutosh, Gorai K K, Shastri A, Bhattacharyya D, Udupa D V
Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400094, India.
Homi Bhabha National Institute, Bhabha Atomic Research Centre, Mumbai 400094, India.
Rev Sci Instrum. 2024 Dec 1;95(12). doi: 10.1063/5.0238362.
We present a comprehensive overview of the commissioning process and initial results of a synchrotron beamline dedicated to atomic, molecular, and optical sciences at the BL-5 undulator port of the Indus-2 synchrotron facility, Raja Ramanna Center for Advanced Technology, Indore, India. The beamline delivers a photon flux of ∼1012 photons/s with high resolving power (∼10 000) over an energy range of 6-800 eV, making it suitable for high-resolution spectroscopy in atomic, molecular, and optical science. The energy tunability from vacuum ultraviolet to soft x-ray (6-800 eV) is achieved through a varied line spacing plane grating monochromator with four gratings: very low energy (VLEG), low energy (LEG), medium energy (MEG), and high energy (HEG). These gratings cover ranges of 6-18, 15-45, 42-126, and 90-800 eV, respectively. A differential pumping system allows windowless transmission of VUV and soft x-ray photons for gas-phase spectroscopic experiments. The beamline also includes an x-ray absorption spectroscopy (XAS) station for solid samples. To demonstrate efficiency, a spectrum was recorded using all four gratings in the 6-300 eV energy range. Standard spectra of Xe and O2 verified the resolution, achieving a resolving power of 7740 with the VLEG, consistent with design specifications. XAS spectra of Cu M, C, and O K-edges were also obtained using MEG and HEG. Details on vacuum level, grating operation, and the first commissioning experiments are presented.
我们全面概述了位于印度印多尔拉贾·拉曼纳先进技术中心的Indus-2同步加速器设施BL-5波荡器端口的一条专门用于原子、分子和光学科学的同步加速器光束线的调试过程及初步结果。该光束线在6 - 800 eV的能量范围内提供约10^12光子/秒的光子通量以及高分辨率（约10000），使其适用于原子、分子和光学科学中的高分辨率光谱学。通过一个带有四个光栅的可变线间距平面光栅单色仪实现从真空紫外到软X射线（6 - 800 eV）的能量可调谐性，这四个光栅分别是：极低能量（VLEG）、低能量（LEG）、中能量（MEG）和高能量（HEG）。这些光栅分别覆盖6 - 18 eV、15 - 45 eV、42 - 126 eV和90 - 800 eV的范围。一个差动抽气系统允许VUV和软X射线光子进行无窗口传输，用于气相光谱实验。该光束线还包括一个用于固体样品的X射线吸收光谱（XAS）站。为了展示效率，在6 - 300 eV能量范围内使用所有四个光栅记录了一个光谱。Xe和O2的标准光谱验证了分辨率，使用VLEG时达到了7740的分辨率，与设计规格一致。还使用MEG和HEG获得了Cu M、C和O K边的XAS光谱。文中给出了真空水平、光栅操作和首次调试实验的详细信息。
