In this type of electron microscope, the electron beam scans the sample in a raster pattern. Initially electrons are generated at the top of the column by the electron source. These are emitted when their thermal energy overcomes the work function of the source material. They are then accelerated and attracted by the positively-charged anode.

The entire electron column must be under vacuum. Like all the components of an electron microscope, the electron source is sealed inside a special chamber in order to preserve vacuum and protect it against contamination, vibrations or noise.

Although the vacuum protects the electron source from being contaminated, it also allows the user to acquire a high-resolution image. In the absence of vacuum, other atoms and molecules can be present in the column. Their interaction with electrons causes the electron beam to deflect and reduces the image quality.

Furthermore, high vacuum increases the collection efficiency of electrons by the detectors that are in the column.

Due to the low vibration level required, the HiPace Plus line is the best solution for electron microscopes. The vibration level of the HiPace Plus is significantly lower than that of standard turbopumps.

Pfeiffer can also offer you a specially developed vibration isolator to reduce the vibration level even further. Since a backing pump is required, Pfeiffer offers various dry solutions, including dry diaphragm pumps, multi-stage Roots or even our newly developed scroll pumps.

A variety of gauges can also be installed in order to provide you with a customized vacuum solution.