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Glossary terms about Compositional Contrast

Compositional Contrast
Contrast from the specimen arising from local changes in surface chemistry

8 pages mention Compositional Contrast

Electromagnetic lenses, apertures and beam size
Electron column
Electron gun
Generating an image
A TOPO mode (topographic) is also available which provides surface landscape information and includes no compositional contrast
Images from electrons
Operation unit
Specimen chamber
What is an SEM (Parts of the machine)?