排除计算机劳厄相指标化错误结果的一种新方法——晶带右旋法

A NEW METHOD OF ELIMINATING WRONG ANSWERS FOR COMPUTER INDEXING THE LAUE PARTTERNN -----THE ZONE RIGHT-HANDED METHOD

计算机劳厄相指标化通常采用晶面(或晶带轴)夹角匹配法,即在劳厄相上选取几个晶带曲线相交(或同一晶带上)的斑点,测量这些斑点的位置,计算它们的反射晶面(或晶带轴)之间的夹角.将这些夹角实验值与标准晶面(或带轴)夹角相匹配,只要两者相吻合,这些斑点(或带轴)的指数就求知。但是,结晶学对晶胞三个基矢的方向有着明确的规定,就是使晶胞体积V=a·(b×c)为正值。亦就是说,三个基矢之间存在着准右旋法则的关系。因此,如果不考虑上述规定,仅采用夹角匹配,其得到的指标化结果中,必包含有违反结晶学对三个基矢定义的错误结果。

The zone right-handed method is proposed. An example of application of this method to eliminating wrong answers for computer indexing the Laue partternn is presented. It is found that this method is more simple than Hart's method[1].