A heavy atom method for finding a better starting point for the refinement of modulated and composite crystals is described. The method is applicable not only for structures containing a heavy atom but also for structures where a modulation of the part of the structure is already known or for composite crystals. The automatic procedure for the interpretation of the Fourier (3+1) dimensional maps was developed and the programs enabling its application were incorporated into the new JANA94 program package. The application of the method is demonstrated on the two modulated structures AsKF4(OH)2.
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