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本文讨论了∑关系用于非中心对称晶体结构±π/2型相角估算的基本原理和实际应用的有关问题。提出了此类相角计算与晶胞原点、对映体选择之间的最优偶合原理。按此原理对两种不同类型已知结构用∑7,∑3关系计算了它们的±π/2型相角符号,取得了较为满意的结果。并对这种估算的可能应用价值进行了探讨。We discuss the fundamental principle and application of estimating ±π/2 type of phase using ∑ relationship in noncentrosymmetrical crystal structures. We obtain an optimum coincident principle between specifying the origin of unit cell, enantiom-orph and estimating ±π/2 type of phase. A group of phases of this type is estimated by ∑7,∑3 relationships for two known crystal structures in terms of the above mentioned principle. The results are satisfactory.
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