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词汇 Xray Crystallography
分类 英语词汇 英语翻译词典
释义

Xray Crystallography

中文百科

X光散射技术 X-ray crystallography

（重定向自Xray Crystallography）
这幅图所显示的是晶体的X光衍射花样，所用晶体为一蛋白质晶体。图中的每一个黑点反映为一个衍射点，这些衍射点是由被晶体散射的X光相互干涉而形成。

X光散射技术（英语：X-ray scattering techniques）是一系列常用的非破坏性分析技术，可用于揭示物质的晶体结构、化学组成以及物理性质。这些技术都是以观测X射线穿过样品后的散射强度为基础，并根据散射角度、极化度和入射X光波长对实验结果进行分析。X光散射技术可在许多不同的条件下进行分析，例如不同的温度或压力。

英语百科

X-ray crystallography X光散射技术

（重定向自Xray Crystallography）
X-ray crystallography provides an atomistic model of zeolite, an aluminosilicate.
Drawing of square (Figure A, above) and hexagonal (Figure B, below) packing from Kepler's work, Strena seu de Nive Sexangula.
As shown by X-ray crystallography, the hexagonal symmetry of snowflakes results from the tetrahedral arrangement of hydrogen bonds about each water molecule. The water molecules are arranged similarly to the silicon atoms in the tridymite polymorph of SiO2. The resulting crystal structure has hexagonal symmetry when viewed along a principal axis.
X-ray crystallography shows the arrangement of water molecules in ice, revealing the hydrogen bonds (1) that hold the solid together. Few other methods can determine the structure of matter with such precision (resolution).

X-ray crystallography is a tool used for identifying the atomic and molecular structure of a crystal, in which the crystalline atoms cause a beam of incident X-rays to diffract into many specific directions. By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal. From this electron density, the mean positions of the atoms in the crystal can be determined, as well as their chemical bonds, their disorder and various other information.
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