Produced by an incident electron passing near an atom in the specimen, near enough to impart some of its energy to a lower energy electron, usually in the K-shell.
This causes a slight energy loss and path change in the incident electron and the ionization of the electron in the specimen atom. This ionized electron then leaves the atom with a very small kinetic energy (5eV) and is then termed a secondary electron. Each incident electron can produce several secondary electrons.
See also: Electron.
Subjects: Nuclear and Particle Physics