electron ionisation

(redirected from Electron Impact)
Also found in: Acronyms.

electron ionisation

The process of molecular ionisation initiated by the interaction of a gas-phase molecule with an energetic electron. The beam of electrons is emitted from a heated metal filament in the source; the electrons are then accelerated through a potential difference of 70 V. The collision between the molecule and the electron causes ejection of an electron from the molecule (M), and produces a radical molecular ion with the unpaired electron (M•).
References in periodicals archive ?
Shima, Mn and Cu K-Shell Ionizaiton Cross Sections by Slow Electron Impact, Phys.
The major products were identified by comparison with archived electron impact spectra as toluene (peak 1), vinyl cyclohexene (peak 2), a [C.
by electron impact (8) is compared to the present theory in Sec.
4), tHcy and metabolites were derivatized to N(O,S}t-butyldimethysilyl derivatives and analyzed by electron impact ionization-MS.
With a new flow-control system that automatically adjusts reagent gas flow and allows automated tuning of the ion source, the Agilent 5975 makes chemical ionization as routine as electron impact ionization, while improving overall sensitivity.
detection uv-vis combines with the mass spectrometer using electron impact ionisation and q-tof analyzer.
The University of York is looking to purchase a gas chromatography system (including auto-sampler and sample preparative system) coupled with a high mass accuracy mass spectrometer, with electron impact ionisation source.

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