用X-射线粉末图计算低对称晶胞参数的方法,自六十年代中期以后,国外已有所进展。1963—1973年间所逐步完善的美国的9214程序,就可作为这一进展的标志。但其语言均未见公开发表,尚难普遍借鉴。另一方面,据有关文献所透露的计算方法看来,它们也还并未能达到完善的程度,有些问题还有待进一步探索。例如,在处理系统误差、在 The method of calculating low symmetry unit cell parameters by X-ray powder pattern has been abroad since the mid-1960s. The United States 9214 program, which was gradually being completed during 1963-1973, can serve as a sign of this progress. However, its language has not been published, is still difficult to learn from. On the other hand, according to the calculation methods disclosed in the relevant literature, they also have not yet reached the level of perfection, and some problems have yet to be further explored. For example, when dealing with systematic errors,