GAMATCH - a genetic algorithm-based program for indexing crystal faces

An intelligent genetic algorithm-based crystal-indexing program, GAMATCH, is described, by means of which the Miller indices of the relevant planes can be unambiguously identified using a set of interplanar angles. A two-step-divide-and-conquer strategy is employed and is found to speed up the convergence to the global solution. The program was tested using both hypothetical and centimetre-sized triphenylmethyl chloride crystals. The results obtained were compared to the expected indices and excellent agreement was noted.