title: Direct phase determination for quasi-kinematical electron diffraction intensity data from organic microcrystals.
abstract: Direct phasing techniques using cosine estimates for three-phase and four-phase structure invariants in space group P1 are applied to zonal hk0 electron diffraction intensity data from an orthorhombic paraffin and a cephalin. Ab initio use of these kinematical phases is shown to derive the correct structures of the methylene subcell packings for these compounds in agreement with earlier determinations from Patterson maps.
mesh_terms: D003461:Crystallography; D004583:Electrons; D006838:Hydrocarbons; D008854:Microscopy, Electron / Q000379:methods*; D008962:Models, Theoretical; D010714:Phosphatidylethanolamines; D012542:Scattering, Radiation; D014961:X-Ray Diffraction
chemical_list: D006838:Hydrocarbons; D010714:Phosphatidylethanolamines