PHASE REFINEMENT ON THE CRYSTAL STRUCTURES CONTAINING HEAVY ATOMS
含重原子晶体结构的相位修正

A modified tangent formular taking account of the presence of heavy atoms is given in this paper. It is of the form:The modified tangent formular has the advantage of being able to eliminate the squaring effect. Practical examination shows that it is superior to the conventional tangent formular and can resolve the ambiguity due to the coexistence of both enan-tiomorphs.