The following gas phase reaction describes the electron ionization process:

Chemical ionization is a lower energy process than electron ionization.

Electron ionization is widely used in mass spectrometry, particularly for organic molecules.

In electron ionization, this is the minimum electron energy that produces an ion.

Above 20 eV, inner electron ionization and Auger transitions become more important.

The most common type of ionization is electron ionization (EI).

By far the most common and perhaps standard form of ionization is electron ionization (EI).

Electron ionization and chemical ionization are used for gases and vapors.

This technology is sometimes used in mass spectrometry in a process called electron ionization to ionize vaporized or gaseous particles.

These ions are often relatively stable, tending not to fragment as readily as ions produced by electron ionization.

During these movements, some electrons collide with a gaseous molecule to form a pair of an ion and an electron (Electron ionization).

In contrast to electron ionization, EC-MS uses low energy electrons in a gas discharge.

This is a less energetic procedure than electron ionization and the ions produced are, for example, protonated molecules: [M + H].

The insulator properties of the gas are controlled by the combination of electron attachment, electron scattering, and electron ionization.

Gas chromatography with mass spectrometry (GC-MS) can be used with electron ionization on full scan mode as a screening test.

With ions produced by electron ionization or laser ionization of atoms or molecules from a rarefied gas, this is referred to as "time-lag focusing".

Electron ionization mass spectra have several distinct sets of peaks: the molecular ion, isotope peaks, fragmentation peaks,metastable peaks.

It is based on the direct and efficient introduction of a liquid effluent into an electron ionization (EI) source where typical, library searchable mass spectra are generated.

Dihydroxymethylidene is produced in the gas phase by neutralization of the dihydroxymethaniumyl radical cation which is formed by dissociative electron ionization of oxalic acid.

For atomic ion IBD, electron ionization, field ionization (Penning ion source) or cathodic arc sources are employed.

Electron ionization (EI, formerly known as electron impact) is an ionization method in which energetic electrons interact with gas phase atoms or molecules to produce ions.

There are several ionization methods: electron ionization, chemical ionization, electrospray, fast atom bombardment, matrix-assisted laser desorption/ionization, and others.

The "hard ionization" process of electron ionization can be softened by the cooling of the molecules before their ionization, resulting in mass spectra that are richer in information.

High performance liquid chromatography (HPLC) and electron ionization mass spectrometry (EIMS) are two analytical techniques that, in principle, seem to be incompatible.

A new approach still under development called Direct-EI LC-MS interface, couples a nano HPLC system and an electron ionization equipped mass spectrometer.