Applications of an amorphous silicon-based area detector for high-resolution, high-sensitivity and fast time-resolved pair distribution function measurements
Applications of an amorphous silicon-based area detector for high-resolution, high-sensitivity and fast time-resolved pair distribution function measurements
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DOI：
10.1107/s0021889807007856
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发表时间：
2007-06-01
影响因子：
6.1
通讯作者：
Lee, Peter L.
中科院分区：
文献类型：
--
作者：
Chupas, Peter J.;Chapman, Karena W.;Lee, Peter L.
对基于非晶硅阵列系统的大面积（41 × 41 cm， 2048 × 2048或1024 × 1024像素）高灵敏度（探测量子效率> 65%）快速读出（高达7.5或30 Hz）平板探测器在高能x射线散射数据收集中的应用进行了评估和讨论，用于定量对分布函数分析。在曝光时间范围内（0.13 s-7 min）收集基准PDF样品：结晶镍金属和非晶二氧化硅（SiO2）的数据。由此产生的pdf的高实空间分辨率（Q（max）高达接近40埃（-1））和在短测量时间内获得的高质量的数据拟合[R-Ni(0.13s) = 10.5%, R-Ni(1.3s) = 6.3%]表明该探测器非常适合材料无序的研究。该探测器在多孔普鲁士蓝体系Mn-3(II)[Co-III(CN)(6)](2) (.) xH(2)中的弱散射H-2分子的进一步应用，以及在30 Hz下(PtO2)-O-IV到Pt-0的原位还原，证实了探测器的高灵敏度，并展示了快速时间分辨研究的新潜力。
The application of a large-area (41 x 41 cm, 2048 x 2048 or 1024 x 1024 pixel) high-sensitivity (detective quantum efficiency > 65%) fast-readout ( up to 7.5 or 30 Hz) flat-panel detector based on an amorphous silicon array system to the collection of high-energy X-ray scattering data for quantitative pair distribution function (PDF) analysis is evaluated and discussed. Data were collected over a range of exposure times (0.13 s-7 min) for benchmark PDF samples: crystalline nickel metal and amorphous silica (SiO2). The high real-space resolution of the resultant PDFs (with Q(max) up to similar to 40 angstrom(-1)) and the high quality of fits to data [R-Ni(0.13s) = 10.5%, R-Ni(1.3s) = 6.3%] obtained in short measurement times indicate that this detector is well suited to studies of materials disorder. Further applications of the detector to locate weakly scattering H-2 molecules within the porous Prussian blue system, Mn-3(II)[Co-III(CN)(6)](2) (.) xH(2), and to follow the in situ reduction of (PtO2)-O-IV to Pt-0 at 30 Hz, confirm the high sensitivity of the detector and demonstrate a new potential for fast time-resolved studies.