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•).
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The electron impact parameter standard values of broadening for this line (0.
gas chromatographs a) a gas chromatograph coupled with mass detector triple quadrupole electron impact (EI);b) a gas chromatograph coupled with mass detector type single quadrupole;c) The gas chromatograph with two detectors FID and attachment headspace consistent with the description of the contract posted on the website of the Employer.
The ionizer is a filament assembly that generates ions directly inside the trap through electron impact of gas molecules.
is a compact reflectron time-of-flight instrument that generates classical electron impact ionization (EI) spectra for gas chromatography and comprehensive GCxGC applications.
A Japan Electron Optics Laboratory HX-100 mass spectrometer (JEOL, Tokyo, Japan) in electron impact mode was used for structure analysis of the metabolites.
Jessenberger and W Hink, Absolute Electron Impact K-Ionization Cross Sections of Titanium and Nickel (**50 keV), Z.
The detector was a Hewlett Packard 5973 operated in the electron impact mode.
The most abundant peaks were identified by comparison to archived electron impact spectra.
The Agilent 5975B features an inert ion source to perform well with active compounds, and the standard ionization source performs both electron impact ionization and chemical ionization (CI).
Acquisition of a gas chromatograph coupled to a single quadrupole mass spectrometer and accessories (automatic injector Split / Splitless, capillary column, source chemical ionization, electron impact source, backing pump, turbo molecular pump for high vacuum, computer and data acquisition software, NIST spectral library).
All compact X-ray sources are based on electron impact technology, which involves generating an electron beam by heating a cathode in a strong electric field.
The present discussion of sensitivity is limited to the full-scan electron impact mode of operation and applies primarily to single-quadruple instruments.

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