Continuous Diffuse Electron Scattering from Polymethylene Compounds II. Oblique Layer Crystals

The positions o f continuous diffuse scattering streaks in electron diffraction patterns from oblique layer crystals isostructura 1 to monoclinic paraffins are predicted using the kinematical difference Fourier transform (DFT) model of Amoros and Amoros. However, indications of correlated chain m otions are found as was seen in a bimolecular rectangular layer structure. This correlated chain “ m otion” and the large temperature factors used for the DFT calculation (which are inconsistent w ith X-ray crystal structure results) suggest the presence o f point defects in the long chains pro­ posed earlier by other workers.