In a number of examples a new method of analysing orientational structures of molecular crystals is illustrated. An application to solid heavy methane demonstrates a close analogy to magnetic structures. In the case of solid p-D2, structure factors are calculated on the basis of the rotational wave functions of the individual molecules and a comparison with neutron diffraction data is performed. Finally several solid phases of ND4Br, representative of the ammonium halides, are investigated and a better understanding of the orientational order in the NaCl-type phase is achieved.
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W. Press (1973) studied this question.