Biomedical subjects
Publications and source records attributed to DL Dorset.
In the paper by Dorset et al. [Acta Cryst. (1999), A55, 901-907], the last line of page 904 should read 'ellipsisthe S atoms. However, the autocorrelation functionellipsis'.
Strong violations of Friedel symmetry are observed in hk0 electron diffraction patterns from lamellar crystals of poly(tert-butylethylene sulfide) obtained at 120 kV. These deviations are largely explained by a multislice dynamical scattering calculation based on the crystal structure model. Further improvement is found when a secondary scattering component is added, in keeping with a perfect crystallite thickness less than that of the lamellar thickness. Despite the multiple-scattering perturbations, the frustrated chain packing can still be determined by direct methods followed by Fourier refinement. However, the Friedel-related intensities must be averaged before calculation of normalized structure factors.