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 ?
The challenge therefore remained of developing a convenient soft ionization technique that retained the performance and wide applicability of standard 70 eV electron ionization.
A key feature of this variable-energy electron ionization technology, known as Select-eV, is the avoidance of sensitivity losses; absolute ion intensities at low energies have been found to be equal to or greater than 70 eV.
I have now completed systematic calculations of the electron ionization cross sections from all subshells that might be relevant for microanalysis.
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.
In the electron ionization process, doubly charged argon is formed, leading to peaks at 20 (40[Ar.
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.
m / z of analytes ionization electron ionization technique with sufficient resolution and accuracy of better than 5 ppm.
In the electron ionization (El) selected ion monitoring mode, it provides femtogram-level sensitivity.
The new solutions include the Agilent 7010 Triple Quadrupole GC/MS System, a high-efficiency electron ionization (EI) source that enables attogram detection limits.
Two principal methods are used to convert samples into ions: electron ionization (EI) and chemical ionization (CI).
The new high-efficiency electron ionization (EI) source enables attogram detection limits-a first for any EI GC/MS/MS system.
The mass detector with quadrupole analyzer and electron ionization for the detection of separated substances to the gas chromatograph Agilent 7890 with complete accessories.