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the electron gun
9.3 - the electron gun
| Term | Definition |
|---|---|
| electron gun task/use | fires small beam of electrons in order to ionise a material or to otherwise change the number of electrons an atom has with specific kenetic energies |
| examples containing electron guns | electron microscopes and spectrometers |
| how electron guns work | heating of a metal filament leads to the electrons undergoing thermionic emission and becoming delocalised. due to the accelerating P.D, the electrons will be attracted to the anode. due to a hole in the anode, the electrons will go through, making a beam |
| specifics about the electron gun | - takes place within a vacuum to prevent the absorption of electrons - the kinetic energy of the electron is equivalent to the voltage multiplied by its (elementary) charge, assuming a negligible amount of energy is lost at the cathode |
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