Kossel花样中的倒易矢量分析

Analysis of reciprocal vector in Kossel pattern

点源发散X光衍射作用(系消光吸收)的花样是空间立体结构的花样。它在照相底片上留下的记录只是局部花样的记录(亦称Kossel花样)。Kossel花样的分布与倒易空间中倒易矢量的分布直接相关联。通过对Kossel花样中倒易矢量的分析,发现了花样的自身规律;导出了解题的间接替代和直接替代方法;总结出虚晶面理论。如果不借助于倒易空间的方法,也没有做倒易矢量分析,对照相底片上记录的花样之间的相互关系做如何解释,可能就束手无策。只要弄清Kossel花样中的倒易矢量分析,Kossel技术的应用就能得心应手操作自如。

The pattern of point-source emission X-ray diffraction(which was the extinction absorption) had three-dimensional structure. Its records on photographic negative were only the records of partial pattern(which was also called Kossel pattern). The distribution of Kossel pattern was directly relevant to the distribution of reciprocal vector in reciprocal space. The inherent law of pattern was found out through the analysis of reciprocal vector in Kossel pattern. The indirect substitution and direct substitution methods for solving were induced. The virtual crystal theory was summarized. If the method of reciprocal space and the analysis of reciprocal vector were not used, it was difficult to explain the relationship among the recorded patterns on photographic negative. As long as the analysis of reciprocal vector in Kossel pattern was understood, the application of Kossel technology would be proficient and manipulable.