A field emission gun is a type of electron source used in electron microscopy that generates a narrow beam of electrons by applying a strong electric field to a sharp metallic tip. This technology allows for the production of highly coherent electron beams, leading to improved resolution in imaging and analysis of nanoscale materials. By utilizing field emission, these guns enhance the performance of electron microscopes, enabling researchers to obtain detailed images and information at the atomic level.
congrats on reading the definition of field emission gun. now let's actually learn it.