electron ionisation

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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 ?
Arguably the least known ingredient in the expression for x ray intensity is the electron ionization cross section.
The eluting compounds were detected by the mass spectrometer which was operated in the electron ionization mode (70 eV).
The mass detector with quadrupole analyzer and electron ionization for the detection of separated substances to the gas chromatograph Agilent 7890 with complete accessories.
The 7000B extends the performance and capabilities with the introduction of more sensitive electron ionization (EI) source and a new chemical ionization (CI) source.
The object of the delivery, installation, operator training qualified personnel and providing warranty and guaranteed customer service one piece of the complete device (hereinafter referred to as "GC / MS / MS") for gas chromatography with tandem mass spectrometer on the principle of triple quadrupole electron ionization.
The Saturn 2000R brings the power of electron ionization analysis into the laboratory at the lowest possible price, lowest cost of ownership, and with groundbreaking simplicity of operation and maintenance," concludes Lauer.