Indexing program for powder patterns especially suitable for triclinic, monoclinic and orthorhombic lattices

A fast computer program written in Fortran is presented. It calculates with a trial-and-error method the unit-cell dimensions from the d values obtained from powder patterns. The special techniques used in this program to keep the computation time short are described. The program itself is designed primarily for triclinic and orthorhombic lattices. Monoclinic lattices are treated like triclinic ones: for tetragonal, hexagonal and rhombohedral structures orthorhombic cells can be calculated.