Acta Crystallographica Section A · 1972 · 78 citations · 0 references
Natural SciencesPhysicsCondensed Matter PhysicsCrystal StructureOpticsCrystal LatticeCrystallographyElectron Beam PhysicsElectron DiffractionElectron MicroscopyTransmission Electron MicroscopyAnalytic ApproximationsDiffraction Data ProcessingDiffraction Pattern AnalysisElectron Beam OpticsElectron CrystallographyElectron Diffraction SimulationImage Contrast EvaluationImage Contrast Mechanisms
The calculation of amplitudes and phases of beams of electrons diffracted from thin (≤ 100 nm) crystals of W4Nb26O77 is described. These diffraction data are used to compute 11-beam 00l electron microscope lattice images and the effects of instrument aberrations are considered. Several approximations are compared with a more exact 435-beam, two-dimensional computation, and with experimental diffraction data and lattice images. Finally, the projected charge density approximation to image contrast is evaluated.