Soft X-ray diffraction patterns measured by a LiF detector with sub-micrometre resolution and an ultimate dynamic range
Soft X-ray diffraction patterns measured by a LiF detector with sub-micrometre resolution and an ultimate dynamic range
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LiF 探测器测量的软 X 射线衍射图案具有亚微米分辨率和极限动态范围
DOI：
10.1107/s1600577520002192
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发表时间：
2020
影响因子：
2.5
通讯作者：
Kodama Ryos
中科院分区：
文献类型：
--
作者：
Makarov Sergey;Pikuz Sergey;Ryazantsev Sergey;Pikuz Tatiana;Buzmakov Alexey;Rose Max;Lazarev Sergey;Senkbeil Tobias;von Gundlach Andreas;Stuhr Susan;Rumancev Christoph;Dzhigaev Dmitry;Skopintsev Petr;Zaluzhnyy Ivan;Viefhaus Jens;Rosenhahn Axel;Kodama Ryos
只有在探测器具有足够的动态范围和/或空间分辨率的情况下，才能充分实现x射线衍射、小x射线散射和高强度相干x射线同步加速器和x射线自由电子激光辐射相衬成像技术的独特诊断可能性。在这项工作中，证明了使用氟化锂（liff）作为光致发光（PL）成像探测器，可以在亚微米空间分辨率内测量动态范围为~ 107的x射线衍射图像。在PETRA III设施中，在一个直径为5µm的圆形孔径后，在500 eV光子能量的光束照射下，在LiF晶体上记录了衍射图样。在衍射条纹中，累积剂量从中央最大值的1.7 × 105 J cm−3变化到衍射条纹第16最大值的2 × 10−2 J cm−3。最后一条条纹的周期测量宽度为0.8µm。研究了LiF晶体作为探测器在500 eV光子辐照剂量下的PL响应。对于用于PL信号读出的卡尔蔡司LSM700型激光扫描共聚焦显微镜，得到了光泵浦（激发）辐射强度（λ = 488 nm）和增益对校准的依赖关系。
The unique diagnostic possibilities of X-ray diffraction, small X-ray scattering and phase-contrast imaging techniques applied with high-intensity coherent X-ray synchrotron and X-ray free-electron laser radiation can only be fully realized if a sufficient dynamic range and/or spatial resolution of the detector is available. In this work, it is demonstrated that the use of lithium fluoride (LiF) as a photoluminescence (PL) imaging detector allows measuring of an X-ray diffraction image with a dynamic range of ∼107 within the sub-micrometre spatial resolution. At the PETRA III facility, the diffraction pattern created behind a circular aperture with a diameter of 5 µm irradiated by a beam with a photon energy of 500 eV was recorded on a LiF crystal. In the diffraction pattern, the accumulated dose was varied from 1.7 × 105 J cm−3 in the central maximum to 2 × 10−2 J cm−3 in the 16th maximum of diffraction fringes. The period of the last fringe was measured with 0.8 µm width. The PL response of the LiF crystal being used as a detector on the irradiation dose of 500 eV photons was evaluated. For the particular model of laser-scanning confocal microscope Carl Zeiss LSM700, used for the readout of the PL signal, the calibration dependencies on the intensity of photopumping (excitation) radiation (λ = 488 nm) and the gain have been obtained.