Mass Spectrometry User Resource and Research Facility (MSURRF)
at School of Chemistry
University Of Wollongong, New South Wales, Australia
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Electron impact ionization uses a beam of high energy electrons to ionize molecules. As the electrons pass through the gas phase sample molecules, they can collide with an electron from the sample molecule's electron cloud, knocking it out like a billiard ball collision. This causes the sample molecule to become a radical cation. Electron impact can also cause the sample molecule to fragment, usually in predictable and characteristic patterns that can be used to identify and characterize the parent sample molecule. Electron ionization can analyze samples with low mass, usually less than 1000 daltons.
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