SEM stands for scanning electron microscope. The SEM is a microscope that uses electrons instead of light to form an image. Since their development in the early 1950's, scanning electron microscopes ...

In scanning electron microscopy, a thermionic electron source such as a tungsten filament is ... The high-energy beam interacts with air and hydrocarbons on the surface of the specimen, "pasting" the ...

Electron microscopes use a focused beam of electrons instead of light to "image" the specimen and gain information as to its structure and composition. Common types of information yielded are ...