Application of a pnCCD for energy-dispersive Laue diffraction with ultra-hard X-rays
Application of a pnCCD for energy-dispersive Laue diffraction with ultra-hard X-rays
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pnCCD 在超硬 X 射线能量色散劳厄衍射中的应用
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
U. Pietsch
中科院分区：
文献类型：
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作者：
S. Send;A. Abboud;N. Wiesner;M. Shokr;T. Çonka;M. Klaus;C. Genzel;D. Schlosser;M. Huth;R. Hartmann;L. Strüder;U. Pietsch
在这项工作中，pnCCD探测器在40和140 keV之间的超硬能量范围内的光谱性能测试通过能量色散劳厄衍射实验上的GaAs晶体。 在BESSY II的摇摆器提供的白色同步辐射下，对任意取向的样品进行单次曝光，收集了大约100个布拉格峰，并在大的倒空间体积中进行了分辨。单个劳厄斑的位置和能量可以用小于一个像素的空间精度和优于1%的相对能量分辨率来确定。以这种方式，GaAs的晶胞参数提取的精度为0.5%，允许记录劳厄图案的完整索引。尽管pnCCD的量子效率较低（低于7%），但考虑到探测器内部的光电吸收和康普顿散射过程，可以从三维数据集获得实验结构因子。从已知的晶体结构计算的测量和理论的运动学结构因子之间的协议是10%的顺序。本实验的结果表明，pnCCD探测器的应用在X射线结构分析使用同步辐射的完整的能谱的潜力。
In this work the spectroscopic performance of a pnCCD detector in the ultra-hard energy range between 40 and 140 keV is tested by means of an energy-dispersive Laue diffraction experiment on a GaAs crystal. About 100 Bragg peaks were collected in a single-shot exposure of the arbitrarily oriented sample to white synchrotron radiation provided by a wiggler at BESSY II and resolved in a large reciprocal-space volume. The positions and energies of individual Laue spots could be determined with a spatial accuracy of less than one pixel and a relative energy resolution better than 1%. In this way the unit-cell parameters of GaAs were extracted with an accuracy of 0.5%, allowing for a complete indexing of the recorded Laue pattern. Despite the low quantum efficiency of the pnCCD (below 7%), experimental structure factors could be obtained from the three-dimensional data sets, taking into account photoelectric absorption as well as Compton scattering processes inside the detector. The agreement between measured and theoretical kinematical structure factors calculated from the known crystal structure is of the order of 10%. The results of this experiment demonstrate the potential of pnCCD detectors for applications in X-ray structure analysis using the complete energy spectrum of synchrotron radiation.
使用劳厄衍射单次晶体结构测定的可行性。
DOI：
10.1107/s0907444909037731
发表时间：
2010
期刊：
Acta crystallographica. Section D, Biological crystallography
影响因子：
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作者：
Cornaby,Sterling;Szebenyi,DolethaME;Smilgies,Detlef-M;Schuller,DavidJ;Gillilan,Richard;Hao,Quan;Bilderback,DonaldH
通讯作者：
Bilderback,DonaldH