In the direct method of crystal structure determination, one usually applies the symbolic addition method and multiple tangent-formula method. For determination of the phase, the selection of starting reflexion set is a key problem for successful analysis of the crystal structures. The convergence method has been applied for determination of starting reflexion set. This paper presents an optimal selection method on starting reflexion set on the basis of the relations between the diffraction indexes and gives an example of examining a known structure.
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