High-resolution electron microscopy refers to a specialized technique that utilizes electrons to obtain images of extremely high resolution and magnification. It is a powerful tool used in experimental physics, materials science, and biology to study the detailed structure and composition of various substances at atomic or near-atomic scales. In this technique, a beam of electrons is accelerated to high speeds and focused onto the sample under investigation.
Unlike traditional light microscopy, which is limited by the diffraction of light, high-resolution electron microscopy overcomes this limitation due to the much shorter wavelength of electrons. As a result, it can reveal fine details of objects on the order of a few angstroms (10^-10 meters) or better.
The high-energy electron beam interacts with the sample, leading to the emission of secondary electrons, backscattered electrons, or scattered electrons. These interactions provide valuable information about the composition, crystal structure, and morphology of the specimen. By carefully controlling the electron beam and detecting the resulting signals, scientists can generate high-resolution images and obtain quantitative data about the studied material.
High-resolution electron microscopy is used in a wide range of fields for diverse applications. These include the study of nanomaterials, catalysts, semiconductors, polymers, biological samples, and even defects and disorders in various materials. By enabling the visualization and analysis of atomic-scale details, this technique plays a crucial role in advancing scientific understanding and technological developments in these areas.
