electron ionisation

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 ?
Contract notice: supply, installation and commissioning of a high-resolution mass spectrometer equipped with an electron ionisation (ei) source coupled with two-dimensional gas chromatography (gc gc)
Rez, Electron Ionisation Cross Sections for K, L, and M Shells, X-Ray Spectrosc.
Contract notice: rfi for a gaschromatography - electron ionisation - high resolution accurate mass spectrometer.