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ion source
An ion source is a device that creates atomic and molecular ions. Ion sources are used to form ions for mass spectrometers, optical emission spectrometers, particle accelerators, ion implanters and ion engines. ==Electron ionization== (詳細はElectron ionization is widely used in mass spectrometry, particularly for organic molecules. The gas phase reaction producing electron ionization is : where M is the atom of molecule being ionized, is the electron, and is the resulting ion. The electrons may be created by an arc discharge between a cathode and an anode. An electron beam ion source (EBIS) is used in atomic physics to produce highly charged ions by bombarding atoms with a powerful electron beam. Its principle of operation is shared by the electron beam ion trap.
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