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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Atomic displacement parameters for Ni(ND_3)_4(NO_2)_2 from 9 K X-ray and 13 K time-of-flight neutron diffraction data
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Atomic displacement parameters for Ni(ND_3)_4(NO_2)_2 from 9 K X-ray and 13 K time-of-flight neutron diffraction data

机译:来自9 K X射线和13 K飞行时间中子衍射数据的Ni(ND_3)_4(NO_2)_2的原子位移参数

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摘要

Structural parameters derived from 9(1)K X-ray diffraction data and 13(1)K time-of-flight neutron diffraction data on perdeuterated tetraamminedinitro-nickel(II), Ni(ND3)4(NO2)2, are compared. It is shown that excellent agreement can be obtained for both positional and thermal parameters derived separately from the two experiments, provided that great care is taken in all steps of the process, including data collection, data reduction, and nuclear and electronic structure refinement. The mean difference in the thermal parameters, <ΔU_(ij)>, is as low as 0.00034 A2 and <(AUij/]12 = 1.92, showing that, even without any form of scaling between the parameters, the same values can be obtained. This, compared with other such studies, indicates that time-of-flight neutron diffraction data can give structural information of a quality comparable to monochromatic neutron diffraction. The excellent correspondence between the thermal parameters derived separately from X-ray and neutron diffraction data gives confidence in the deconvolution of the thermal motion from the X-ray diffraction data, which is necessary for any study of a static electron density distribution.
机译:比较了从氘化四胺二硝基镍(II)Ni(ND3)4(NO2)2的9(1)K X射线衍射数据和13(1)K飞行时间中子衍射数据得出的结构参数。结果表明,只要在过程的所有步骤(包括数据收集,数据缩减以及核和电子结构改进)中都格外小心,就可以分别获得从两个实验分别得出的位置参数和热参数的优异一致性。热参数的平均差<ΔU_(ij)>低至0.00034 A2和<(AUij / ] 12 = 1.92,这表明,即使参数之间没有任何形式的缩放, ,可以获得相同的值。与其他此类研究相比,这表明飞行时间中子衍射数据可以提供质量与单色中子衍射相当的结构信息。从X射线衍射数据和中子衍射数据分别得出的热参数之间的极佳对应关系使人们对X射线衍射数据的热运动解卷积充满信心,这对于任何静态电子密度分布的研究都是必要的。

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