Structure Solution Using HRTEM
Electron microscopy is the only method known today that allows us to directly see the atoms in a sample. Compared to X-ray crystallography, crystals billions of times smaller can be studied by electron crystallography. The fundamental difference between (electron microscopy) images and diffraction patterns is explained. Images have a one-to-one relation to each point in the object. This is not the case for diffraction patterns, where each point comes from all points in the sample. The crystallographic structure factor phases that are necessary to know in order to solve a crystal structure, can be read out numerically directly from the Fourier transform of an image, but not from diffraction patterns.
KeywordsDiffraction Pattern HRTEM Image Black Ring Atomic Resolution Unit Cell Dimension