Definition of Electron Impact Ionization

Electron impact ionization is also known as electron ionization is defined as a method of ionization in which the energized electrons tend to interact with the atoms or molecules of a solid or a gas phase to produce ions. It was the first-ever technique developed to produce ions in mass spectrometry. It is considered a high fragmentation technique since very energetic electrons are employed to produce the ions.


These ions are then used to determine the structure of unknown compounds. This method is very much useful for those organic molecules which have a molecular weight of less than 600. Furthermore, many volatile, as well as thermally stable compounds, can also be detected with the aid of this technique.

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