Abstract
A trial-and-error method is described for facilitating the indexing of X-ray powder patterns with the help of a computer. It is based on the variation of parameters by dichotomy, i.e. successive division of available phase space. The observational errors are rigorously treated. The program, written in Fortran IV, presupposes orthorhombic or higher symmetry. The principles used are illustrated with several X-ray powder patterns.
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