On integrating the techniques of direct methods with anomalous dispersion: the one-phase structure seminvariants in the monoclinic and orthorhombic systems. III. Primitive non-centrosymmetric space groups of type 1P220

Abstract

In a recent paper by Velmurugan & Hauptman [Acta Cryst. (1989), A45, 158-163], conditional probability distributions were derived for the one-phase structure seminvariants in the presence of anomalous scattering for the monoclinic system and for the space groups of type 1P222 in the orthorhombic system. This paper is an extension of the above paper for the primitive non-centrosymmetric space groups of type 1P220 in the orthorhombic system. The one-phase structure seminvariants are of the form Φ2h′2k′0. Since the theory for this case was treated in the earlier paper, only a brief summary of results is given here.