Improvements in resolution, depth of field, and electron detection technology have allowed SEMs to produce even more detailed and insightful images of specimens. Technological innovations such as ...

A vacuum provides the needed insulation to prevent "arching" or jumping of high voltages in the electron gun. The gun itself is under extremely high vacuum conditions, requiring a pressure as low as ...

The SEM is an instrument that produces a largely magnified image by using electrons instead of light to form an image. A beam of electrons is produced at the top of the microscope by an electron gun.

In the FE-SEM, a second anode is also used, placed very close to the tip. This allows for very precise accelerating voltage capacities. The combination of these two anodes determines the final ...

The thermionic electron gun can be set from 1-20kV. The SEM scans a beam of electrons over the specimen to produce a magnified image. The electrons from the beam hit the surface of the sample and ...