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Electron ionization. Electron ionization (EI, formerly known as electron impact ionization [1] and electron bombardment ionization [2]) is an ionization method in which energetic electrons interact with solid or gas phase atoms or molecules to produce ions. [3] EI was one of the first ionization techniques developed for mass spectrometry. [4]
The electron rescattering model was independently developed by Kuchiev, [47] Schafer et al, [48] Corkum, [49] Becker and Faisal [50] and Faisal and Becker. [51] The principal features of the model can be understood easily from Corkum's version. Corkum's model describes the NS ionization as a process whereby an electron is tunnel ionized.
Electron capture ionization (ECI) is the ionization of a gas phase atom or molecule by attachment of an electron to create an ion of the form A −•.The reaction is + where the M over the arrow denotes that to conserve energy and momentum a third body is required (the molecularity of the reaction is three).
The original ionisation event liberates one electron, and each subsequent collision liberates a further electron, so two electrons emerge from each collision to sustain the avalanche. In electromagnetism , the Townsend discharge or Townsend avalanche is an ionisation process for gases where free electrons are accelerated by an electric field ...
[1] This is the minimum electron energy that produces an ion. [2] In photoionization , it is the minimum photon energy of a photon that produces some ion signal. For example, the indene bromide ion (IndBr+) only loses bromine at an incident photon energy of 10.2 eV, so the product, indenyl, has an appearance energy of 10.2 eV.
Electron ionization; Electron-capture mass spectrometry; Electrospray ionization; Electrostatic spray ionization; Extractive electrospray ionization; F. Fast atom ...
There are several ionization methods: electron ionization, chemical ionization, electrospray, fast atom bombardment, matrix-assisted laser desorption/ionization, and others. Also, mass spectrometry is categorized by approaches of mass analyzers: magnetic-sector , quadrupole mass analyzer , quadrupole ion trap , time-of-flight , Fourier ...
The observation of electron tracks that were independent of the frequency of the incident photon suggested a mechanism for electron ionization that was caused from an internal conversion of energy from a radiationless transition. Further investigation, and theoretical work using elementary quantum mechanics and transition rate/transition ...