Analysis of powder diffraction patterns of monoclinic and triclinic crystals

Based upon the published methods of indexing powder data of triclinic crystals, a systematic method of computerizing the procedures is devised and the ways of conveniently treating various errors are discussed. For monoclinic crystals, a new function, R'(i,h,k), is introduced and its efficacy of deriving lattice parameters is shown. The merits and demerits of the present methods are compared with those of methods previously reported.